diff --git a/phpBB/includes/functions_messenger.php b/phpBB/includes/functions_messenger.php
index fbac3e6f1d..ae393739b9 100644
--- a/phpBB/includes/functions_messenger.php
+++ b/phpBB/includes/functions_messenger.php
@@ -902,6 +902,8 @@ class queue
 			fclose($fp);
 
 			phpbb_chmod($this->cache_file, CHMOD_READ | CHMOD_WRITE);
+
+			$this->data = array();
 		}
 
 		$lock->release();