October: The layout of tab is crashes when I add a (grouped) repeater item

[gergo85]

Expected behavior

Actual behavior

Reproduce steps

1. Extend a form with some fields (http://octobercms.com/docs/plugin/extending#extending-backend-form).
2. After that add single or gouped repeater item.

October build

442

[seanthepottingshed]

Event::listen('backend.form.extendFields', function ($widget) {
    if ($widget->isNested) {
        return;
    }
});

[LukeTowers]

@gergo85 or @seanthepottingshed could you guys find relevant places in the documentation to add the following:

> **Note:** When extending the form, you should check to see if `$formWidget->isNested === false` as the Repeater FormWidget includes nested Form widgets which can cause your changes to be made in unexpected places.

[seanthepottingshed]

@LukeTowers

• https://github.com/octobercms/docs/pull/321

[gergo85]

@seanthepottingshed Thank you for your answer!