Description

The CrewAI framework throws an AttributeError: 'NoneType' object has no attribute 'replace' when attempting to execute a Crew with an Agent configured with only the system_template parameter, while the prompt_template is left undefined (i.e., None).
And ,if prompt_template proveded also,but response_template not provided,error occurred also!

Steps to Reproduce

simple example

Expected behavior

no error,if these three parameters are optional

Screenshots/Code snippets

from crewai import Agent, Task, Crew

Incorrect Agent configuration (missing prompt_template)

designer = Agent(
name="WeChat Layout Expert",
role="WeChat Layout Expert",
goal="Design and optimize the generated article for WeChat public accounts.",
backstory="You are a professional WeChat public account layout designer, familiar with WeChat layout rules.",
allow_delegation=False,
memory=True,
max_rpm=150,
system_template="You are a professional WeChat public account layout designer...", # system_template present

prompt_template is missing

)

Task and Crew setup (example)

task = Task(description="Layout task", agent=designer)
crew = Crew(agents=[designer], tasks=[task])

Attempting to execute the Crew will result in the error

crew.kickoff()

Operating System

Windows 11

Python Version

3.10

crewAI Version

102

crewAI Tools Version

no tool

Virtual Environment

Venv

Evidence

Traceback (most recent call last):
File "C:\Users\X\Desktop\test\src\test\main.py", line 26, in run
Test().crew().kickoff(inputs=inputs)
^^^^^^^^^^^
File "C:\Users\X\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\project\crew_base.py", line 36, in init
self.map_all_task_variables()
File "C:\Users\X\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\project\crew_base.py", line 203, in map_all_task_variables
self._map_task_variables(
File "C:\Users\X\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\project\crew_base.py", line 236, in _map_task_variables
self.tasks_config[task_name]["agent"] = agentsagent_name
^^^^^^^^^^^^^^^^^^^^
File "C:\Users\X\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\project\utils.py", line 11, in memoized_func
cache[key] = func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\X\Desktop\test\src\test\crew.py", line 37, in designer
return Agent(
^^^^^^
File "C:\Users\X\AppData\Local\Programs\Python\Python311\Lib\site-packages\pydantic\main.py", line 214, in init
validated_self = self.pydantic_validator.validate_python(data, self_instance=self)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\X\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\agent.py", line 133, in post_init_setup
self._setup_agent_executor()
File "C:\Users\X\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\agent.py", line 143, in _setup_agent_executor
self.set_cache_handler(self.cache_handler)
File "C:\Users\X\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\agents\agent_builder\base_agent.py", line 341, in set_cache_handler
self.create_agent_executor()
File "C:\Users\X\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\agent.py", line 291, in create_agent_executor
).task_execution()
^^^^^^^^^^^^^^^^
File "C:\Users\X\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\utilities\prompts.py", line 41, in task_execution
"prompt": self._build_prompt(
^^^^^^^^^^^^^^^^^^^
File "C:\Users\X\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\utilities\prompts.py", line 67, in _build_prompt
prompt = prompt_template.replace(
^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'replace'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "C:\Users\X\Desktop\test\src\test\main.py", line 175, in
test()
File "C:\Users\X\Desktop\test\src\test\main.py", line 171, in test
run(inputs)
File "C:\Users\X\Desktop\test\src\test\main.py", line 28, in run
raise Exception(f"An error occurred while running the crew: {e}")
Exception: An error occurred while running the crew: 'NoneType' object has no attribute 'replace'

Traceback (most recent call last):
File "C:\Users\XX\Desktop\test\src\test\main.py", line 26, in run
Test().crew().kickoff(inputs=inputs)
^^^^^^^^^^^
File "C:\Users\XX\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\project\crew_base.py", line 36, in init
self.map_all_task_variables()
File "C:\Users\XX\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\project\crew_base.py", line 203, in map_all_task_variables
self._map_task_variables(
File "C:\Users\XX\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\project\crew_base.py", line 236, in _map_task_variables
self.tasks_config[task_name]["agent"] = agentsagent_name
^^^^^^^^^^^^^^^^^^^^
File "C:\Users\XX\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\project\utils.py", line 11, in memoized_func
cache[key] = func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\XX\Desktop\test\src\test\crew.py", line 37, in designer
return Agent(
^^^^^^
File "C:\Users\XX\AppData\Local\Programs\Python\Python311\Lib\site-packages\pydantic\main.py", line 214, in init
validated_self = self.pydantic_validator.validate_python(data, self_instance=self)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\XX\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\agent.py", line 133, in post_init_setup
self._setup_agent_executor()
File "C:\Users\XX\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\agent.py", line 143, in _setup_agent_executor
self.set_cache_handler(self.cache_handler)
File "C:\Users\XX\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\agents\agent_builder\base_agent.py", line 341, in set_cache_handler
self.create_agent_executor()
File "C:\Users\XX\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\agent.py", line 291, in create_agent_executor
).task_execution()
^^^^^^^^^^^^^^^^
File "C:\Users\XX\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\utilities\prompts.py", line 41, in task_execution
"prompt": self._build_prompt(
^^^^^^^^^^^^^^^^^^^
File "C:\Users\XX\AppData\Local\Programs\Python\Python311\Lib\site-packages\crewai\utilities\prompts.py", line 70, in _build_prompt
response = response_template.split("{{ .Response }}")[0]
^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'split'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "C:\Users\XX\Desktop\test\src\test\main.py", line 175, in
test()
File "C:\Users\XX\Desktop\test\src\test\main.py", line 171, in test
run(inputs)
File "C:\Users\XX\Desktop\test\src\test\main.py", line 28, in run
raise Exception(f"An error occurred while running the crew: {e}")
Exception: An error occurred while running the crew: 'NoneType' object has no attribute 'split'

Possible Solution

i dont know

Additional context

use system_template（prompt_template、response_template provided）,gemini cant run correctly,,,but deepseek 、qwq32b run no error