diff --git a/libraries/classes/Table.php b/libraries/classes/Table.php
index e5e56d7409..3551b65365 100644
--- a/libraries/classes/Table.php
+++ b/libraries/classes/Table.php
@@ -403,7 +403,7 @@ class Table implements Stringable
             return '';
         }
 
-        return $tableRowFormat;
+        return $tableRowFormat ?? '';
     }
 
     /**