diff --git a/phpBB/includes/functions_messenger.php b/phpBB/includes/functions_messenger.php
index 6abfb40b01..810f2c0584 100644
--- a/phpBB/includes/functions_messenger.php
+++ b/phpBB/includes/functions_messenger.php
@@ -931,6 +931,8 @@ class queue
 			{
 				// Do nothing
 			}
+
+			$this->data = array();
 		}
 
 		$lock->release();