diff --git a/lib/private/App/AppManager.php b/lib/private/App/AppManager.php
index 7778393b3b38c..74ea3f56e2cf6 100644
--- a/lib/private/App/AppManager.php
+++ b/lib/private/App/AppManager.php
@@ -920,7 +920,7 @@ public function setDefaultApps(array $defaultApps): void {
 
 	public function isBackendRequired(string $backend): bool {
 		foreach ($this->appInfos as $appInfo) {
-			foreach ($appInfo['dependencies']['backend'] as $appBackend) {
+			foreach ($appInfo['dependencies']['backend'] ?? [] as $appBackend) {
 				if ($backend === $appBackend) {
 					return true;
 				}