diff --git a/kiri-engine/Pool/Pool.php b/kiri-engine/Pool/Pool.php
index 93e15c35..886423bf 100644
--- a/kiri-engine/Pool/Pool.php
+++ b/kiri-engine/Pool/Pool.php
@@ -69,9 +69,7 @@ class Pool extends Component
 		$lists = [];
 		while (($pdo = $channel->pop()) instanceof PDO) {
 			$pdo->check();
-
 			$lists[] = $pdo;
-
 		}
 		foreach ($lists as $list) {
 			$channel->push($list);