diff --git a/src/Mysql/PDO.php b/src/Mysql/PDO.php
index 3825e6d..34b4c98 100644
--- a/src/Mysql/PDO.php
+++ b/src/Mysql/PDO.php
@@ -72,13 +72,13 @@ class PDO implements StopHeartbeatCheck
 	 */
 	public function heartbeat_check(): void
 	{
-		if (env('state') == 'exit') {
+		if (env('state','start') == 'exit') {
 			return;
 		}
 		if ($this->_timer === -1 && Context::inCoroutine()) {
 			$this->_timer = Timer::tick(1000, function () {
 				try {
-					if (env('state') == 'exit') {
+					if (env('state','start') == 'exit') {
 						echo 'timer end.' . PHP_EOL;
 						$this->stopHeartbeatCheck();
 					}