isOpen() generates an error if the page is in draft mode

[GB_DESIGN]

Yes, it’s about this topic, where you’ve already helped me:

Submenu: How do I always display the active page in 1st position?

I am using the “independent sub sub menu”. I would like to not only highlight the active page with CSS, but also always display it in the first position. What is the best way to do this? <?php // independent sub sub menu $items = false; // get the open item on the first level if($root1 = $pages->findBy('isOpen', true)) { // get the open item on the second level if($root2 = $root1->children()->findOpen()) { // get visible children of the second level item $items = $root2->child…

And when exactly does this happen?

When I open the draft from the panel, the error message appears.
With status listed and unlisted don’t generate an error.

<?php e($item->isOpen(), 'text-red', 'text-green') ?>

Since this includes already an if/else query, I don’t understand why an error message appears. Or do I need another if/else query for the if/else query? That would only make the construct more complex.

The error is only displayed in draft mode. But explain that to a customer who wants to check their prepared article in the frontend. Then my phone will be ringing off the hook

Before I look for a solution, my question is: Kirby error or user error?