diff --git a/src/Storage/DBFile.php b/src/Storage/DBFile.php
index 36473dcf..46e02b03 100644
--- a/src/Storage/DBFile.php
+++ b/src/Storage/DBFile.php
@@ -145,7 +145,7 @@ public function getFrontendTemplate(): string
         // Check that path is available
         $url = $this->getURL();
         if (empty($url)) {
-            return null;
+            return '';
         }
 
         // Image template for supported images