diff --git a/ruoyi-fastapi-backend/utils/semantic_cache_service.py b/ruoyi-fastapi-backend/utils/semantic_cache_service.py
index 12637ce..71a31c6 100644
--- a/ruoyi-fastapi-backend/utils/semantic_cache_service.py
+++ b/ruoyi-fastapi-backend/utils/semantic_cache_service.py
@@ -413,14 +413,18 @@ def get_semantic_cache_service() -> SemanticCacheService:
 # 便捷函数
 async def lookup_question(chat_id: str, question: str, redis_client=None) -> Optional[Tuple[str, float]]:
     """查找缓存问题"""
-    logger.info(f"[SemanticCache.lookup_question] 🔍 函数被调用 | chat_id={chat_id} | question={question} | redis_client={redis_client is not None}")
-    service = get_semantic_cache_service()
-    logger.info(f"[SemanticCache.lookup_question] 获取服务实例完成 | service={service is not None}")
-    result = await service.lookup(chat_id, question, redis_client)
-    logger.info(f"[SemanticCache.lookup_question] 返回 | result={result is not None}")
-    if result:
-        logger.info(f"[SemanticCache.lookup_question] 命中结果 | answer_length={len(result[0])} | similarity={result[1]:.2f}")
-    return result
+    try:
+        logger.info(f"[SemanticCache.lookup_question] 🔍 函数被调用 | chat_id={chat_id} | question={question} | redis_client={redis_client is not None}")
+        service = get_semantic_cache_service()
+        logger.info(f"[SemanticCache.lookup_question] 获取服务实例完成 | service={service is not None}")
+        result = await service.lookup(chat_id, question, redis_client)
+        logger.info(f"[SemanticCache.lookup_question] 返回 | result={result is not None}")
+        if result:
+            logger.info(f"[SemanticCache.lookup_question] 命中结果 | answer_length={len(result[0])} | similarity={result[1]:.2f}")
+        return result
+    except Exception as e:
+        logger.error(f"[SemanticCache.lookup_question] 异常: {e}")
+        return None
 
 
 async def store_qa_pair(chat_id: str, question: str, answer: str, redis_client=None) -> bool: