diff --git a/src/plugins/PFC/conversation.py b/src/plugins/PFC/conversation.py
index c1b314266..9f744c30c 100644
--- a/src/plugins/PFC/conversation.py
+++ b/src/plugins/PFC/conversation.py
@@ -525,9 +525,9 @@ class Conversation:
                     )
                 action_successful = True
             except Exception as fetch_err:
-                logger.error(f"[私聊][{self.private_name}]获取知识时出错: {fetch_err}")
+                logger.error(f"[私聊][{self.private_name}]获取知识时出错: {str(fetch_err)}")
                 conversation_info.done_action[action_index].update(
-                    {"status": "recall", "final_reason": f"获取知识失败: {fetch_err}"}
+                    {"status": "recall", "final_reason": f"获取知识失败: {str(fetch_err)}"}
                 )
                 self.conversation_info.last_successful_reply_action = None  # 重置状态
 
diff --git a/src/plugins/PFC/pfc_KnowledgeFetcher.py b/src/plugins/PFC/pfc_KnowledgeFetcher.py
index 099b4979e..673e418cb 100644
--- a/src/plugins/PFC/pfc_KnowledgeFetcher.py
+++ b/src/plugins/PFC/pfc_KnowledgeFetcher.py
@@ -68,16 +68,19 @@ class KnowledgeFetcher:
             max_depth=3,
             fast_retrieval=False,
         )
-        knowledge = ""
+        knowledge_text = ""
+        sources = []
         if related_memory:
-            sources = []
             for memory in related_memory:
-                knowledge += memory[1] + "\n"
+                knowledge_text += memory[1] + "\n"
                 sources.append(f"记忆片段{memory[0]}")
-            knowledge = knowledge.strip(), "，".join(sources)
+            knowledge_text = knowledge_text.strip()
+            sources_text = "，".join(sources)
+
+        knowledge_text += "现在有以下**知识**可供参考：\n "
+        knowledge_text += self._lpmm_get_knowledge(query)
+        knowledge_text += "请记住这些**知识**，并根据**知识**回答问题。\n"
+
+        return knowledge_text or "未找到相关知识", sources_text or "无记忆匹配"
 
-        knowledge += "现在有以下**知识**可供参考：\n "
-        knowledge += self._lpmm_get_knowledge(query)
-        knowledge += "请记住这些**知识**，并根据**知识**回答问题。\n"
 
-        return "未找到相关知识", "无记忆匹配"