diff --git a/kiri-engine/Pool/Pool.php b/kiri-engine/Pool/Pool.php
index 26e3adbd..b7bc3f51 100644
--- a/kiri-engine/Pool/Pool.php
+++ b/kiri-engine/Pool/Pool.php
@@ -65,8 +65,11 @@ class Pool extends Component
 	public function check($name): array
 	{
 		$channel = $this->channel($name);
-		$count = $success = 0;
+		if ($channel->length() < 1) {
+			return [0, 0];
+		}
 
+		$count = $success = 0;
 		$lists = [];
 		while (($pdo = $channel->pop()) instanceof PDO) {
 			$count += 1;
diff --git a/kiri-engine/Pool/SplQueue.php b/kiri-engine/Pool/SplQueue.php
index 08376f6f..3fbfba52 100644
--- a/kiri-engine/Pool/SplQueue.php
+++ b/kiri-engine/Pool/SplQueue.php
@@ -56,6 +56,9 @@ class SplQueue implements QueueInterface
 	public function pop(float $timeout = -1): mixed
 	{
 		// TODO: Implement pop() method.
+		if ($this->channel->count() < 1) {
+			return null;
+		}
 		return $this->channel->dequeue();
 	}