Jinja template error rendering in LMStudio

[Ondest]

Reproduction steps

I'm not sure it's a zed bug, but Nvidia Nemotron Nano and Devstral2 Small isn't work.

I tested in LMstudio itself, Cherry Studio, VSCode(Continue) and this models works nicely. I tried few jinja templates from huggingface, but they doesn't change much, only error type.

UPD:
I also made test with custom AI compatible provider inside built-in agent for both models and works flawlessly with vLLM and Lemonade

Current vs. Expected behavior

Nemotron

Any prompt suitable

---

Devstral

Prompt with multiple tool calls, reffers to tool call pipeline in model card i assume.

Zed version and system specs

Zed: v0.217.3+stable.105.80433cb239e868271457ac376673a5f75bc4adb1 (Zed)
OS: Linux Wayland fedora 42
Memory: 30.5 GiB
Architecture: x86_64
GPU: AMD Radeon RX 9070 XT (RADV GFX1201) || radv || Mesa 25.3.2

Attach Zed log file

Zed.log

2025-12-19T19:27:34+03:00 INFO  [agent] Received prompt request for session: d2be3b23-7b38-48e7-bee1-bc69cfa1566a
2025-12-19T19:27:34+03:00 INFO  [agent::thread] Thread::send called with model: nvidia_nemotron-3-nano-30b-a3b
2025-12-19T19:27:52+03:00 ERROR [agent::thread] Turn execution failed: Error rendering prompt with jinja template: "Cannot apply filter "string" to type: NullValue".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.
2025-12-19T19:27:52+03:00 ERROR [agent] Error in model response stream: Error rendering prompt with jinja template: "Cannot apply filter "string" to type: NullValue".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.
2025-12-19T19:30:37+03:00 INFO  [agent] Received prompt request for session: af8edefd-afa5-4072-8ef9-a6b9c8298eee
2025-12-19T19:30:37+03:00 INFO  [agent::thread] Thread::send called with model: nvidia_nemotron-3-nano-30b-a3b
2025-12-19T19:30:48+03:00 ERROR [agent::thread] Turn execution failed: Error rendering prompt with jinja template: "Unknown test: sequence".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.
2025-12-19T19:30:48+03:00 ERROR [agent] Error in model response stream: Error rendering prompt with jinja template: "Unknown test: sequence".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.
2025-12-19T19:31:05+03:00 INFO  [agent] Received prompt request for session: 619dbbb2-fef5-4f4f-bcb0-1589364452c6
2025-12-19T19:31:05+03:00 INFO  [agent::thread] Thread::send called with model: nvidia_nemotron-3-nano-30b-a3b
2025-12-19T19:31:19+03:00 ERROR [agent::thread] Turn execution failed: Error rendering prompt with jinja template: "Unknown test: sequence".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.
2025-12-19T19:31:19+03:00 ERROR [agent] Error in model response stream: Error rendering prompt with jinja template: "Unknown test: sequence".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.
2025-12-19T19:32:36+03:00 WARN  [terminal::terminal_hyperlinks] Timed out processing path hyperlink regexes after 2ms
2025-12-19T19:32:36+03:00 INFO  [terminal::terminal_hyperlinks] 1ms time out specified in `terminal.path_hyperlink_timeout_ms`
2025-12-19T19:35:50+03:00 INFO  [agent] Received prompt request for session: d16d0a07-bf41-4f0c-bca3-4efe2fea53f7
2025-12-19T19:35:50+03:00 INFO  [agent::thread] Thread::send called with model: nvidia_nemotron-3-nano-30b-a3b
2025-12-19T19:36:04+03:00 ERROR [agent::thread] Turn execution failed: Error rendering prompt with jinja template: "Unknown test: sequence".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.
2025-12-19T19:36:04+03:00 ERROR [agent] Error in model response stream: Error rendering prompt with jinja template: "Unknown test: sequence".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.
2025-12-19T19:38:55+03:00 ERROR [agent::thread] Turn execution failed: Error rendering prompt with jinja template: "Unknown test: sequence".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.
2025-12-19T19:38:55+03:00 ERROR [agent] Error in model response stream: Error rendering prompt with jinja template: "Unknown test: sequence".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.
2025-12-19T19:40:48+03:00 INFO  [agent] Received prompt request for session: 0a7c589a-b5da-43d7-a3fa-7c2d98a4377f
2025-12-19T19:40:48+03:00 INFO  [agent::thread] Thread::send called with model: nvidia_nemotron-3-nano-30b-a3b
2025-12-19T19:40:58+03:00 ERROR [agent::thread] Turn execution failed: Error rendering prompt with jinja template: "Unknown test: sequence".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.
2025-12-19T19:40:58+03:00 ERROR [agent] Error in model response stream: Error rendering prompt with jinja template: "Unknown test: sequence".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.
2025-12-19T19:52:19+03:00 INFO  [project::lsp_store] language server 14: unregistered workspace/DidChangeWatchedFiles capability with id 9f6cc8b3-f532-44eb-8939-9ae460ff0e58
2025-12-19T19:52:19+03:00 INFO  [project::lsp_store] language server 14: unregistered workspace/DidChangeWatchedFiles capability with id 66dd4e61-5d1d-4ae0-8962-386b6bdbd63a
2025-12-19T19:53:57+03:00 INFO  [agent] Received prompt request for session: 0b5b3ccc-134f-4eb1-8c0c-5eafc73e770e
2025-12-19T19:53:57+03:00 INFO  [agent::thread] Thread::send called with model: Devstral
2025-12-19T19:54:33+03:00 ERROR [agent::thread] Turn execution failed: Error rendering prompt with jinja template: "Unknown StringValue filter: safe".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.
2025-12-19T19:54:33+03:00 ERROR [agent] Error in model response stream: Error rendering prompt with jinja template: "Unknown StringValue filter: safe".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.

Relevant Zed settings

settings.json

Relevant Keymap

keymap.json

(for AI issues) Model provider details

LM Studio 0.3.36 (Build 1)

• mistralai_devstral-small-2-24b-instruct-2512
• nvidia_nemotron-3-nano-30b-a3b

If you are using WSL on Windows, what flavor of Linux are you using?

Fedora

[mspinelli]

Can confirm I get a similar error, though slightly different message, with the Unsloth version of nemotron-3-nano-30b-a3b-5-k-m-gguf served from LM Studio:

2025-12-27 17:41:07 [DEBUG]
 Received request: POST to /api/v0/chat/completions with body  {
  "model": "nemotron-3-nano-30b-a3b-k-m-gguf",
  "messages": [
    {
      "role": "system",
      "content": "You are a highly skilled software engineer with ex... <Truncated in logs> ... are powered by the model named nemotron-3-nano.\n\n"
    },
    {
      "role": "user",
      "content": "Create a space invaders like game in a single html file"
    }
  ],
  "stream": true,
  "max_tokens": -1,
  "stop": [],
  "tools": [
    {
      "type": "function",
      "function": {
        "name": "copy_path",
        "description": "Copies a file or directory in the project, and ret... <Truncated in logs> ...d over that approach whenever copying is the goal.",
        "parameters": {
          "required": [
            "source_path",
            "destination_path"
          ],
          "properties": {
            "source_path": {
              "description": "The source path of the file or directory to copy.\n... <Truncated in logs> ...ce_path of \"directory1/a/something.txt\"\n</example>",
              "type": "string"
            },
            "destination_path": {
              "description": "The destination path where the file or directory s... <Truncated in logs> ...ination_path of \"directory2/b/copy.txt\"\n</example>",
              "type": "string"
            }
          },
          "description": "Copies a file or directory in the project, and ret... <Truncated in logs> ...d over that approach whenever copying is the goal.",
          "type": "object",
          "additionalProperties": false
        }
      }
    },
    {
      "type": "function",
      "function": {
        "name": "create_directory",
        "description": "Creates a new directory at the specified path with... <Truncated in logs> ...need to create new directories within the project.",
        "parameters": {
          "required": [
            "path"
          ],
          "properties": {
            "path": {
              "description": "The path of the new directory.\n\n<example>\nIf the p... <Truncated in logs> ...ng a path of \"directory1/new_directory\"\n</example>",
              "type": "string"
            }
          },
          "description": "Creates a new directory at the specified path with... <Truncated in logs> ...need to create new directories within the project.",
          "type": "object",
          "additionalProperties": false
        }
      }
    },
    {
      "type": "function",
      "function": {
        "name": "delete_path",
        "description": "Deletes the file or directory (and the directory's... <Truncated in logs> ...project, and returns confirmation of the deletion.",
        "parameters": {
          "required": [
            "path"
          ],
          "properties": {
            "path": {
              "description": "The path of the file or directory to delete.\n\n<exa... <Truncated in logs> ... a path of \"directory1/a/something.txt\"\n</example>",
              "type": "string"
            }
          },
          "description": "Deletes the file or directory (and the directory's... <Truncated in logs> ...project, and returns confirmation of the deletion.",
          "type": "object",
          "additionalProperties": false
        }
      }
    },
    {
      "type": "function",
      "function": {
        "name": "diagnostics",
        "description": "Get errors and warnings for the project or a speci... <Truncated in logs> ...error. The user can help you fix it.\n</guidelines>",
        "parameters": {
          "properties": {
            "path": {
              "description": "The path to get diagnostics for. If not provided, ... <Truncated in logs> ... should use the path `ipsum/dolor.txt`.\n</example>",
              "type": [
                "string",
                "null"
              ]
            }
          },
          "type": "object",
          "description": "Get errors and warnings for the project or a speci... <Truncated in logs> ...error. The user can help you fix it.\n</guidelines>",
          "additionalProperties": false
        }
      }
    },
    {
      "type": "function",
      "function": {
        "name": "edit_file",
        "description": "This is a tool for creating a new file or editing ... <Truncated in logs> ...arent directory exists and is the correct location",
        "parameters": {
          "required": [
            "display_description",
            "path",
            "mode"
          ],
          "properties": {
            "display_description": {
              "description": "A one-line, user-friendly markdown description of ... <Truncated in logs> ...nput object so that we can display it immediately.",
              "type": "string"
            },
            "path": {
              "description": "The full path of the file to create or modify in t... <Truncated in logs> ...\n</example>\n\n<example>\n`frontend/db.js`\n</example>",
              "type": "string"
            },
            "mode": {
              "description": "The mode of operation on the file. Possible values... <Truncated in logs> ...iting it as opposed to recreating it from scratch.",
              "type": "string",
              "enum": [
                "edit",
                "create",
                "overwrite"
              ]
            }
          },
          "description": "This is a tool for creating a new file or editing ... <Truncated in logs> ...arent directory exists and is the correct location",
          "type": "object",
          "additionalProperties": false
        }
      }
    },
    {
      "type": "function",
      "function": {
        "name": "fetch",
        "description": "Fetches a URL and returns the content as Markdown.",
        "parameters": {
          "required": [
            "url"
          ],
          "properties": {
            "url": {
              "description": "The URL to fetch.",
              "type": "string"
            }
          },
          "description": "Fetches a URL and returns the content as Markdown.",
          "type": "object",
          "additionalProperties": false
        }
      }
    },
    {
      "type": "function",
      "function": {
        "name": "find_path",
        "description": "Fast file path pattern matching tool that works wi... <Truncated in logs> ...al 'offset' parameter to request subsequent pages.",
        "parameters": {
          "required": [
            "glob"
          ],
          "properties": {
            "glob": {
              "description": "The glob to match against every path in the projec... <Truncated in logs> ...hs by providing a glob of \"*thing*.txt\"\n</example>",
              "type": "string"
            },
            "offset": {
              "description": "Optional starting position for paginated results (0-based).\nWhen not provided, starts from the beginning.",
              "type": "integer",
              "format": "uint",
              "minimum": 0,
              "default": 0
            }
          },
          "description": "Fast file path pattern matching tool that works wi... <Truncated in logs> ...al 'offset' parameter to request subsequent pages.",
          "type": "object",
          "additionalProperties": false
        }
      }
    },
    {
      "type": "function",
      "function": {
        "name": "grep",
        "description": "Searches the contents of files in the project with... <Truncated in logs> ...olely to escape characters in the tool parameters.",
        "parameters": {
          "required": [
            "regex"
          ],
          "properties": {
            "regex": {
              "description": "A regex pattern to search for in the entire projec... <Truncated in logs> ...will only be matched against the code **content**.",
              "type": "string"
            },
            "include_pattern": {
              "description": "A glob pattern for the paths of files to include i... <Truncated in logs> ...Rust files across all root directories.\n</example>",
              "type": [
                "string",
                "null"
              ]
            },
            "offset": {
              "description": "Optional starting position for paginated results (0-based).\nWhen not provided, starts from the beginning.",
              "type": "integer",
              "format": "uint32",
              "minimum": 0,
              "default": 0
            },
            "case_sensitive": {
              "description": "Whether the regex is case-sensitive. Defaults to false (case-insensitive).",
              "type": "boolean",
              "default": false
            }
          },
          "description": "Searches the contents of files in the project with... <Truncated in logs> ...olely to escape characters in the tool parameters.",
          "type": "object",
          "additionalProperties": false
        }
      }
    },
    {
      "type": "function",
      "function": {
        "name": "list_directory",
        "description": "Lists files and directories in a given path. Prefer the `grep` or `find_path` tools when searching the codebase.",
        "parameters": {
          "required": [
            "path"
          ],
          "properties": {
            "path": {
              "description": "The fully-qualified path of the directory to list ... <Truncated in logs> ...az`, you should use the path `foo/baz`.\n</example>",
              "type": "string"
            }
          },
          "description": "Lists files and directories in a given path. Prefer the `grep` or `find_path` tools when searching the codebase.",
          "type": "object",
          "additionalProperties": false
        }
      }
    },
    {
      "type": "function",
      "function": {
        "name": "move_path",
        "description": "Moves or rename a file or directory in the project... <Truncated in logs> ...or directory without changing its contents at all.",
        "parameters": {
          "required": [
            "source_path",
            "destination_path"
          ],
          "properties": {
            "source_path": {
              "description": "The source path of the file or directory to move/r... <Truncated in logs> ...ce_path of \"directory1/a/something.txt\"\n</example>",
              "type": "string"
            },
            "destination_path": {
              "description": "The destination path where the file or directory s... <Truncated in logs> ...tion_path of \"directory2/b/renamed.txt\"\n</example>",
              "type": "string"
            }
          },
          "description": "Moves or rename a file or directory in the project... <Truncated in logs> ...or directory without changing its contents at all.",
          "type": "object",
          "additionalProperties": false
        }
      }
    },
    {
      "type": "function",
      "function": {
        "name": "now",
        "description": "Returns the current datetime in RFC 3339 format.\nO... <Truncated in logs> ...k would benefit from knowing the current datetime.",
        "parameters": {
          "required": [
            "timezone"
          ],
          "properties": {
            "timezone": {
              "description": "The timezone to use for the datetime.",
              "oneOf": [
                {
                  "description": "Use UTC for the datetime.",
                  "type": "string",
                  "const": "utc"
                },
                {
                  "description": "Use local time for the datetime.",
                  "type": "string",
                  "const": "local"
                }
              ]
            }
          },
          "description": "Returns the current datetime in RFC 3339 format.\nO... <Truncated in logs> ...k would benefit from knowing the current datetime.",
          "type": "object",
          "additionalProperties": false
        }
      }
    },
    {
      "type": "function",
      "function": {
        "name": "open",
        "description": "This tool opens a file or URL with the default app... <Truncated in logs> ...that the user would like for you to use this tool.",
        "parameters": {
          "required": [
            "path_or_url"
          ],
          "properties": {
            "path_or_url": {
              "description": "The path or URL to open with the default application.",
              "type": "string"
            }
          },
          "description": "This tool opens a file or URL with the default app... <Truncated in logs> ...that the user would like for you to use this tool.",
          "type": "object",
          "additionalProperties": false
        }
      }
    },
    {
      "type": "function",
      "function": {
        "name": "read_file",
        "description": "Reads the content of the given file in the project... <Truncated in logs> ...le without line numbers if you receive an outline.",
        "parameters": {
          "required": [
            "path"
          ],
          "properties": {
            "path": {
              "description": "The relative path of the file to read.\n\nThis path ... <Truncated in logs> ...uld use the path `directory2/file.txt`.\n</example>",
              "type": "string"
            },
            "start_line": {
              "description": "Optional line number to start reading on (1-based index)",
              "type": [
                "integer",
                "null"
              ],
              "format": "uint32",
              "minimum": 0,
              "default": null
            },
            "end_line": {
              "description": "Optional line number to end reading on (1-based index, inclusive)",
              "type": [
                "integer",
                "null"
              ],
              "format": "uint32",
              "minimum": 0,
              "default": null
            }
          },
          "description": "Reads the content of the given file in the project... <Truncated in logs> ...le without line numbers if you receive an outline.",
          "type": "object",
          "additionalProperties": false
        }
      }
    },
    {
      "type": "function",
      "function": {
        "name": "terminal",
        "description": "Executes a shell one-liner and returns the combine... <Truncated in logs> ...can't rely on any state from previous invocations.",
        "parameters": {
          "required": [
            "command",
            "cd"
          ],
          "properties": {
            "command": {
              "description": "The one-liner command to execute.",
              "type": "string"
            },
            "cd": {
              "description": "Working directory for the command. This must be one of the root directories of the project.",
              "type": "string"
            }
          },
          "description": "Executes a shell one-liner and returns the combine... <Truncated in logs> ...can't rely on any state from previous invocations.",
          "type": "object",
          "additionalProperties": false
        }
      }
    },
    {
      "type": "function",
      "function": {
        "name": "thinking",
        "description": "A tool for thinking through problems, brainstormin... <Truncated in logs> ...egies, or outline approaches before taking action.",
        "parameters": {
          "required": [
            "content"
          ],
          "properties": {
            "content": {
              "description": "Content to think about. This should be a description of what to think about or a problem to solve.",
              "type": "string"
            }
          },
          "description": "A tool for thinking through problems, brainstormin... <Truncated in logs> ...egies, or outline approaches before taking action.",
          "type": "object",
          "additionalProperties": false
        }
      }
    }
  ]
}
2025-12-27 17:41:07  [INFO]
 [nemotron-3-nano-30b-a3b-k-m-gguf] Running chat completion on conversation with 2 messages.
2025-12-27 17:41:07  [INFO]
 [nemotron-3-nano-30b-a3b-k-m-gguf] Streaming response...
2025-12-27 17:41:07 [DEBUG]
 1 Error predicting: Error: Error rendering prompt with jinja template: "Cannot apply filter "string" to type: NullValue".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.
    at /Applications/LM Studio.app/Contents/Resources/app/.webpack/lib/llmworker.js:85:48675
    at async _0x36116b.<computed> (/Applications/LM Studio.app/Contents/Resources/app/.webpack/lib/llmworker.js:85:40492)
    at async _0x1dd293.<computed> (/Applications/LM Studio.app/Contents/Resources/app/.webpack/lib/llmworker.js:118:6607)
    at async _0x377829.temp_createLlamaPredictionArgs (/Applications/LM Studio.app/Contents/Resources/app/.webpack/lib/llmworker.js:31:2849)
    at async _0x572508.<computed>.predictTokens (/Applications/LM Studio.app/Contents/Resources/app/.webpack/lib/llmworker.js:85:21360)
    at async _0x1346ba.predictTokens (/Applications/LM Studio.app/Contents/Resources/app/.webpack/lib/llmworker.js:124:17545)
    at async _0x1346ba.handleMessage (/Applications/LM Studio.app/Contents/Resources/app/.webpack/lib/llmworker.js:124:7020)
2025-12-27 17:41:07 [ERROR]
 [nemotron-3-nano-30b-a3b-k-m-gguf] Error rendering prompt with jinja template: "Cannot apply filter "string" to type: NullValue".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.. Error Data: n/a, Additional Data: n/a

I can chat directly with the model in LM Studio, but zed fails. It seems it's related perhaps to a previous issue with qwen-3-coder so perhaps that fix may inform on how to fix this one?

qwen-3-coder issue in zed: #35006 which was referenced from LM Studio's issue with a similar error: lmstudio-ai/lmstudio-bug-tracker#812

[sbunce]

Same exact error for me when connecting Zed 0.217.3 to lmstudio 0.3.36 and running nvidia/nemotron-3-nano.

2025-12-31 20:33:30 [ERROR]
 [nvidia/nemotron-3-nano] Error rendering prompt with jinja template: "Cannot apply filter "string" to type: NullValue".

This is usually an issue with the model's prompt template. If you are using a popular model, you can try to search the model under lmstudio-community, which will have fixed prompt templates. If you cannot find one, you are welcome to post this issue to our discord or issue tracker on GitHub. Alternatively, if you know how to write jinja templates, you can override the prompt template in My Models > model settings > Prompt Template.. Error Data: n/a, Additional Data: n/a

I can also directly chat with the model in lmstudio and that works perfectly.

I tried having claude modify the prompt. Got it working part way, but it was showing </think> tags after things randomly (not hiding thinking text).

prompt.txt

Is this some problem with newlines around the think tags maybe?

zed/crates/assistant_text_thread/src/text_thread.rs

Line 2044 in 554382a

const THOUGHT_PROCESS_START_MARKER: &str = "<think>\n";

I don't really understand the exact interaction between all the parts here. Does nemotron output json, which gets baked with jinja, then zed parses tags in the output? (guessing how it works here)

Anyways, not a serious bug for me as I mostly use claude. But it'd be fun to be able to try out nemotron locally. So sharing info/progress I've made.