diff --git a/lib/Controller/FolderController.php b/lib/Controller/FolderController.php
index b931a5db9..2f00cfa68 100644
--- a/lib/Controller/FolderController.php
+++ b/lib/Controller/FolderController.php
@@ -98,6 +98,10 @@ private function checkFolderExists(int $id): ?DataResponse {
 		if ($storageId === null) {
 			return new DataResponse([], Http::STATUS_NOT_FOUND);
 		}
+		$folder = $this->manager->getFolder($id, $storageId);
+		if ($folder === false) {
+			return new DataResponse([], Http::STATUS_NOT_FOUND);
+		}
 		return null;
 	}