langgenius/dify · error · InternalServerError

The server encountered an internal error and was unable to c

Error message

The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.

What it means

The catch-all InternalServerError in _get_message_suggested_questions (api/controllers/console/app/message.py:532-534). Any exception not matched by the specific handlers (MessageNotExists, ConversationNotExists, provider token/quota/model, InvokeError, disabled-feature) is logged via logger.exception and re-raised as a generic 500. It means an unexpected server-side fault occurred during suggested-question generation.

Source

Thrown at api/controllers/console/app/message.py:534

            session=session,
        )
    except MessageNotExistsError:
        raise NotFound("Message not found")
    except ConversationNotExistsError:
        raise NotFound("Conversation not found")
    except ProviderTokenNotInitError as ex:
        raise ProviderNotInitializeError(ex.description)
    except QuotaExceededError:
        raise ProviderQuotaExceededError()
    except ModelCurrentlyNotSupportError:
        raise ProviderModelCurrentlyNotSupportError()
    except InvokeError as e:
        raise CompletionRequestError(e.description)
    except SuggestedQuestionsAfterAnswerDisabledError:
        raise AppSuggestedQuestionsAfterAnswerDisabledError()
    except Exception:
        logger.exception("internal server error.")
        raise InternalServerError()

    return dump_response(SuggestedQuestionsResponse, {"data": questions})


def _get_message_detail(*, session: Session, app_model: App, message_id: UUID):
    message_id_str = str(message_id)

    message = session.scalar(
        select(Message).where(Message.id == message_id_str, Message.app_id == app_model.id).limit(1)
    )

    if not message:
        raise NotFound("Message Not Exists.")

    attach_message_extra_contents([message])
    return dump_response(MessageDetailResponse, MessageResponseSource(message, session=session))

View on GitHub (pinned to ef8544b173)

Solutions

1. Inspect the server logs — logger.exception captures the full traceback that the generic 500 hides from the client.
2. Reproduce with the same message_id and capture the stack trace to identify the unhandled exception type.
3. If a new domain error type was introduced upstream, add a dedicated except branch to translate it instead of relying on the catch-all.
4. Verify DB connectivity and that the message/conversation rows are intact.
5. Retry once after confirming the service is healthy.

try {
  return await callSuggestedQuestions()
} catch (e) {
  if (e.status === 500) { notifyAdmin(e); /* surface generic error */ }
  throw e
}

When it happens

Trigger: An unanticipated exception during MessageService.get_suggested_questions_after_answer — e.g. serialization bug, DB session error, None dereference in the service, or a new error type the controller does not yet translate.

Common situations: Database connectivity blip; ORM object missing an expected attribute after a partial migration; bug in a recently changed service; resource exhaustion (memory/CPU) causing a runtime error; corrupted message row.

Related errors

• completion_request_error
• app_suggested_questions_after_answer_disabled
• Internal Server Error
• provider_not_initialize
• provider_quota_exceeded

AI-assisted analysis of langgenius/dify@ef8544b173 (2026-08-12). Data as JSON: /api/errors/ebe1fc33620e85da. Report an issue: GitHub.