We’ve released the version 2.1.6 that may cause compatibility issues with some themes.

This is due to the integration with the popular library called Mega Menu that causes this issue. We recommend that you contact the Theme Developer to make the following changes to your Theme:

The wp_nav_menu_item_custom_fields hook that expects 5 arguments are only given 4 arguments by Mega Menu and this causes the fatal error.

WP native hook contains 5 arguments here:
do_action( 'wp_nav_menu_item_custom_fields', $item_id, $item, $depth, $args, $id );

File name: wp-admin/includes/class-walker-nav-menu-edit.php

But MegaMenu library uses the same hook ‘wp_nav_menu_item_custom_fields’ but passes 4 arguments only.

do_action( 'wp_nav_menu_item_custom_fields', $item_id, $item, $depth, $args );

• – If you have any questions or issues, please feel free to open a new topic and we’d be happy to help 🙂 https://wordpress.org/support/plugin/ultimate-member/#new-topic-0
• – If you are a paying customer and have issues with premium extensions, please submit a ticket to our website as we cannot provide support in the free support forum: https://ultimatemember.com/support/
• – Want to rollback to a previous version? Use this plugin to rollback to any versions: https://wordpress.org/plugins/wp-rollback/
• Sales questions/inquiries are also welcome via UM site: https://ultimatemember.com/contact/sales/