diff --git a/src/Mysql/PDO.php b/src/Mysql/PDO.php
index 3b672b7..3825e6d 100644
--- a/src/Mysql/PDO.php
+++ b/src/Mysql/PDO.php
@@ -80,6 +80,7 @@ class PDO implements StopHeartbeatCheck
 				try {
 					if (env('state') == 'exit') {
 						echo 'timer end.' . PHP_EOL;
+						$this->stopHeartbeatCheck();
 					}
 					if (time() - $this->_last > 10 * 60) {
 						$this->stopHeartbeatCheck();