fix: Agent run failed error

api/core/agent/agent_executor.py

 import enum
+import logging
 from typing import Union, Optional
 
 from langchain.agents import BaseSingleActionAgent, BaseMultiActionAgent
@@ -107,7 +108,11 @@ class AgentExecutor:
             callbacks=self.configuration.callbacks
         )
 
-        output = agent_executor.run(query)
+        try:
+            output = agent_executor.run(query)
+        except Exception:
+            logging.exception("agent_executor run failed")
+            output = None
 
         return AgentExecuteResult(
             output=output,

api/core/completion.py

@@ -126,7 +126,7 @@ class Completion:
                       memory: Optional[ReadOnlyConversationTokenDBBufferSharedMemory], streaming: bool):
         # When no extra pre prompt is specified,
         # the output of the agent can be used directly as the main output content without calling LLM again
-        if not app_model_config.pre_prompt and agent_execute_result \
+        if not app_model_config.pre_prompt and agent_execute_result and agent_execute_result.output \
                 and agent_execute_result.strategy != PlanningStrategy.ROUTER:
             final_llm = FakeLLM(response=agent_execute_result.output,
                                 origin_llm=agent_execute_result.configuration.llm,