Error occurring in 3.0.6 and 3.0.8 on Line 125 of “…./theme-updater-class.php

Before and after updating from 3.06 to 3.08 of the theme and before and after updating to WP 6.2, this theme is generating a FATAL error periodically when the wp-admin login is attempted. Both the backend and front end of the site is then locked up until an administrator enters WordPress Recovery Mode using the link provided in the error message, and then error clears. But this is a problem for the client’s daily use of the site.

The error started occurring suddenly when no changes to the site plug-ins, the theme or WordPress core had been made for over a week.

An error of type E_ERROR was caused in line 125 of the file /srv/htdocs/wp-content/themes/online-shop-pro/acmethemes/updater/theme-updater-class.php. Error message: Uncaught Error: Attempt to modify property “no_update” on bool in /srv/htdocs/wp-content/themes/online-shop-pro/acmethemes/updater/theme-updater-class.php:125
Stack trace:
#0 /wordpress/core/6.2/wp-includes/class-wp-hook.php(310): EDD_Theme_Updater->theme_update_transient(false)
#1 /wordpress/core/6.2/wp-includes/plugin.php(205): WP_Hook->apply_filters(false, Array)
#2 /wordpress/core/6.2/wp-includes/option.php(2004): apply_filters(‘site_transient_…’, false, ‘update_themes’)
#3 /wordpress/core/6.2/wp-includes/update.php(911): get_site_transient(‘update_themes’)
#4 /wordpress/core/6.2/wp-admin/menu.php(33): wp_get_update_data()
#5 /wordpress/core/6.2/wp-admin/admin.php(158): require(‘/wordpress/core…’)
#6 /wordpress/core/6.2/wp-admin/edit.php(10): require_once(‘/wordpress/core…’)
#7 {main}
thrown