diweb

Just a quick follow‑up on this report.

After more in‑depth debugging, we’ve confirmed that the PHP warning:

PHP Warning: Undefined array key 2 in /wp-admin/includes/plugin.php on line 2020

was not caused by White Label CMS.

The issue on our installation turned out to be another component adding malformed entries to the global $submenu array, specifically items that only contained something like:

array(
    4 => 'some-css-class',
);

with no slug at index [2]. When WordPress core iterates over submenu and expects $item[2] to exist, this structure triggers the Undefined array key 2 warning.

White Label CMS was initially suspected because it also manipulates admin menus, and we had added a custom MU plugin around WLCMS_Admin_Menus to harden its menu handling under PHP 8+. However, after adding a separate MU plugin that logs malformed submenu items, all the problematic entries we saw were coming from outside White Label CMS.

So, to be precise:

• White Label CMS is not the source of the Undefined array key 2 warning we reported earlier.
• Our custom hardening around WLCMS is working fine, but it was not the component breaking WordPress core’s submenu iteration.

Apologies for the earlier noise and for pointing in the wrong direction.
You can safely disregard the previous assumption that WLCMS’ submenu handling was causing this particular PHP warning.

Hello, I was able to locate a post related to my problem. https://wordpress.org/support/topic/cart-gets-empty-after-customer-registration/

I have resolved the issue by setting the Login prevention method setting in “Use login filter from woocommerce”. The phrase that clarifies what it does just below the selector helped me relate the topics.

You can mark this topic as a result.

Hi, I am attaching screenshots so you can see how it is displayed from the backend.
Screenshot 1. From the “visual” tab – https://ibb.co/gTNLH5C
Capture 2. From the “HTML” tab – https://ibb.co/WFr0mwL
Screenshot 3. From “Highlight Code – Elementor Pro”. This plugin also uses prism.js so in principle I would say that it has nothing to do with a bug in prism.js https://ibb.co/HHdbCX7

You can download the code here: https://filedn.eu/lK9Fjb0HWdCQIhpP7mw2MXk/pruebas-wiki.json

I thank you in advance for the support and help

• This reply was modified 3 years, 3 months ago by diweb.

Hello, it seems that someone decided again to put the attribute “important!” to the CSS rules.

Same problem again about class .qc-cmp-ui

I need min-height without “important!”

Thanks