dify1.2.0版本的一个小bug

查看api容器，发现了一个报错：

问题：

2025-06-06 14:11:56.115 ERROR [Dummy-2] [completion.py:137] - internal server error.
Traceback (most recent call last):
  File "/app/api/controllers/web/completion.py", line 112, in post
    response = AppGenerateService.generate(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/api/services/app_generate_service.py", line 73, in generate
    AgentChatAppGenerator().generate(
  File "/app/api/core/app/apps/agent_chat/app_generator.py", line 170, in generate
    (conversation, message) = self._init_generate_records(application_generate_entity, conversation)
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/api/core/app/apps/message_based_app_generator.py", line 156, in _init_generate_records
    conversation_name = (query[:20] + "…") if len(query) > 20 else query
                                              ^^^^^^^^^^
TypeError: object of type 'NoneType' has no len()
2025-06-06 14:11:56.125 ERROR [Dummy-2] [app.py:875] - Exception on /api/chat-messages [POST]
Traceback (most recent call last):
  File "/app/api/controllers/web/completion.py", line 112, in post
    response = AppGenerateService.generate(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/api/services/app_generate_service.py", line 73, in generate
    AgentChatAppGenerator().generate(
  File "/app/api/core/app/apps/agent_chat/app_generator.py", line 170, in generate
    (conversation, message) = self._init_generate_records(application_generate_entity, conversation)
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/api/core/app/apps/message_based_app_generator.py", line 156, in _init_generate_records
    conversation_name = (query[:20] + "…") if len(query) > 20 else query
                                              ^^^^^^^^^^
TypeError: object of type 'NoneType' has no len()

During handling of the above exception, another exception occurred:

进入容器：

docker exec -it dify_api_1 bash

# 找到文件
vim /app/api/core/app/apps/message_based_app_generator.py
# 在156行前面加一句
query = query or "New conversation"
conversation_name = (query[:20] + "…") if len(query) > 20 else query

停止容器：

docker compose stop

启动容器：

docker compose start

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