diff --git a/monitor.py b/monitor.py
index 0035f90..4b9ccee 100644
--- a/monitor.py
+++ b/monitor.py
@@ -7619,7 +7619,7 @@ class MessageMonitor:
             _kv_pattern = re.search(r'["\']?\w+["\']?\s*[:：]\s*["\']?[^"\']+["\']?', _json_content)
             if _kv_pattern:
                 # ⭐ Task #1595: 检查用户消息特征
-                _has_user_msg_feature = '@' in text and re.search(r'@\w+', text)
+                _has_user_msg_feature = '@' in text and bool(re.search(r'@\w+', text))
                 _has_user_msg_feature |= any(q in text for q in ['?', '？', '吗', '呢', '多少', '怎么', '如何', '哪', '什么', '几'])
                 if _has_user_msg_feature:
                     logger.debug(f"[ocr] 过滤器2结果: 检测到JSON但含用户消息特征，继续检查: {text[:80]!r}")