LSP error with telescope pickers while using augment.vim

[FelixLisczyk]

I get an LSP error when using Telescope pickers while augment.vim is installed. I first noticed this issue while using pickers in the xcodebuild.nvim plugin, but the problem occurs even without that plugin. The error goes away when I uninstall augment.vim.

Steps to Reproduce:

1. Install augment.vim plugin
2. Add the minimal reproduction code to your Neovim config (see below)
3. Trigger the telescope picker with <leader>q
4. Observe the error (see below)

Expected Behavior:
The picker should work normally without LSP-related errors while augment.vim is installed.

Actual Behavior:
The following error occurs:

Error executing lua callback: .../neovim/0.10.4_1/share/nvim/runtime/lua/vim/lsp/sync.lua:180: attempt to get length of local 'prev_line' (a nil value)
stack traceback:
        .../neovim/0.10.4_1/share/nvim/runtime/lua/vim/lsp/sync.lua:180: in function 'compute_start_range'
        .../neovim/0.10.4_1/share/nvim/runtime/lua/vim/lsp/sync.lua:416: in function 'compute_diff'
        ...0.4_1/share/nvim/runtime/lua/vim/lsp/_changetracking.lua:106: in function 'incremental_changes'
        ...0.4_1/share/nvim/runtime/lua/vim/lsp/_changetracking.lua:311: in function 'send_changes_for_group'
        ...0.4_1/share/nvim/runtime/lua/vim/lsp/_changetracking.lua:348: in function 'send_changes'
        ...ellar/neovim/0.10.4_1/share/nvim/runtime/lua/vim/lsp.lua:580: in function <...ellar/neovim/0.10.4_1/share/nvim/runtime/lua/vim/lsp.lua:574>

Minimal Reproduction:

local function show_minimal_picker()
  local pickers = require("telescope.pickers")
  local finders = require("telescope.finders")
  local conf = require("telescope.config").values

  local picker = pickers.new({}, {
    prompt_title = "Minimal Picker",
    finder = finders.new_table({
      results = { "Test" },
    }),
    sorter = conf.generic_sorter(),
  })

  picker:find()

  -- Trigger LSP change tracking
  vim.api.nvim_buf_set_lines(0, 0, -1, false, { "Triggering LSP changes..." })
end

return {
  {
    "augmentcode/augment.vim",
    config = function()
      vim.keymap.set("n", "<leader>q", show_minimal_picker, { desc = "Show Minimal Picker" })
    end,
  },
}

Environment:

• Neovim version: 0.10.4
• Telescope version: 0.1.8
• augment.vim version: 0.21.0
• Operating System: macOS 15.3.1

[Mulchman]

Thank you for reporting this!

I've noticed that the error doesn't appear if I open a file, like a random .sh or .cpp, before opening a Telescope window.

[FelixLisczyk]

That's interesting. On my machine, the error occurs every time, whether I've opened a file before or not.

[mtpauly]

Hi all, I have a change that will go out in tomorrow mornings prerelease that I believe will fix this issue. Please let me know if the issue persists and we can continue to debug.

[FelixLisczyk]

This issue has been fixed in the latest version on the prerelease branch. Thank you!