diff --git a/modules/backend/classes/FormField.php b/modules/backend/classes/FormField.php
index 4adf2e571..403c0b81e 100644
--- a/modules/backend/classes/FormField.php
+++ b/modules/backend/classes/FormField.php
@@ -254,6 +254,10 @@ class FormField
      */
     protected function evalConfig($config)
     {
+        if(is_null($config)) {
+            $config = [];
+        }
+
         /*
          * Standard config:property values
          */