diff --git a/Queue/Queue.php b/Queue/Queue.php
index cde52628..6a5296e6 100644
--- a/Queue/Queue.php
+++ b/Queue/Queue.php
@@ -81,7 +81,13 @@ class Queue extends \Snowflake\Process\Process
 	 */
 	public function delivery(Consumer $consumer, $score = 0)
 	{
-		$this->waiting->add($consumer, $score);
+		try {
+			$consumer->onWaiting();
+		} catch (\Throwable $exception) {
+			$this->application->error($exception->getMessage());
+		} finally {
+			$this->waiting->add($consumer, $score);
+		}
 	}
 
 
diff --git a/System/Abstracts/BaseObject.php b/System/Abstracts/BaseObject.php
index caae0144..dec00e44 100644
--- a/System/Abstracts/BaseObject.php
+++ b/System/Abstracts/BaseObject.php
@@ -169,7 +169,7 @@ class BaseObject implements Configure
 	 * @param string $message
 	 * @param string|null $method
 	 * @param string|null $file
-	 * @throws Exception
+	 * @throws
 	 */
 	public function error($message, $method = null, $file = null)
 	{