diff --git a/api/src/Storage/Merge.php b/api/src/Storage/Merge.php
index 68dd084b11..94f019af90 100644
--- a/api/src/Storage/Merge.php
+++ b/api/src/Storage/Merge.php
@@ -1752,7 +1752,7 @@ abstract class Merge
 				break;
 			default:
 				$app = str_replace('_merge', '', get_class($this));
-				if(!in_array($app, array_keys($GLOBALS['egw_info']['apps'])))
+				if(!in_array($app, array_keys($GLOBALS['egw_info']['apps'] ?? [])))
 				{
 					$app = false;
 				}