Warning: Undefined array key in WorkflowDefaultWidget->formElement() line 87

chetan 11 → made their first commit to this issue’s fork.

Please check the above raised MR.

The change seems fairly simple.

Bu ti am curious about the root cause. This can only happen if you have added 'additional fields' to the workflow.
Did you?
Please give details.

This would be the shorter version of the patch:

@@ -84,7 +82,7 @@ class WorkflowDefaultWidget extends WidgetBase {
     // Determine and add the attached fields.
     $attached_fields = WorkflowManager::getAttachedFields('workflow_transition', $wid);
     foreach ($attached_fields as $key => $attached_field) {
-      $element[$key] = $workflow_form[$key];
+      $element[$key] = $workflow_form[$key] ?? 'Default Value';
     }