diff --git a/modules/backend/widgets/Form.php b/modules/backend/widgets/Form.php
index c7e702a99..741fc7d46 100644
--- a/modules/backend/widgets/Form.php
+++ b/modules/backend/widgets/Form.php
@@ -449,6 +449,10 @@ class Form extends WidgetBase
         $eventResults = $this->fireSystemEvent('backend.form.refresh', [$result], false);
 
         foreach ($eventResults as $eventResult) {
+            if (!is_array($eventResult)) {
+                continue;
+            }
+            
             $result = $eventResult + $result;
         }