diff --git a/src/main/java/com/actiontech/dble/backend/heartbeat/MySQLDetector.java b/src/main/java/com/actiontech/dble/backend/heartbeat/MySQLDetector.java
index 2935cc6c9..ecdf12025 100644
--- a/src/main/java/com/actiontech/dble/backend/heartbeat/MySQLDetector.java
+++ b/src/main/java/com/actiontech/dble/backend/heartbeat/MySQLDetector.java
@@ -80,7 +80,7 @@ public class MySQLDetector implements SQLQueryResultListener<SQLQueryResult<Map<
     }
 
     public void heartbeat() {
-        if (con == null) {
+        if (con == null || con.isClosed()) {
             heartbeat.setResult(MySQLHeartbeat.ERROR_STATUS);
             return;
         }