diff --git a/lib/private/Updater.php b/lib/private/Updater.php
index 2c5820fdd8bcc..8f21e09165067 100644
--- a/lib/private/Updater.php
+++ b/lib/private/Updater.php
@@ -418,7 +418,7 @@ private function upgradeAppStoreApps(array $apps, array $previousEnableStates =
 
 				if (!empty($previousEnableStates)) {
 					$ocApp = new \OC_App();
-					if (!empty($previousEnableStates[$app])) {
+					if (!empty($previousEnableStates[$app]) && is_array($previousEnableStates[$app])) {
 						$ocApp->enable($app, $previousEnableStates[$app]);
 					} else {
 						$ocApp->enable($app);