Uncaught Error in bp-learndash-functions.php

[designboxcom]

Hi,
As advised on your Facebook chat, I am opening here an issue. Not sure though this is the right place. Nor the right plugin.
We use your Buddypress-Learndash plugin. The Group option is deactivated as long as we don't need it.
However, the error logs are filled with the following error:
[26-Mar-2020 23:38:14 UTC] PHP Fatal error: Uncaught Error: Call to undefined function groups_is_user_member() in /home/XXXXXX/wp-content/plugins/buddypress-learndash/includes/bp-learndash-functions.php:701Stack trace:#0 /home/XXXXXX/wp-content/plugins/buddypress-learndash/includes/bp-learndash-loader.php(596): bp_learndash_user_course_access_update(15, 2158, false)#1 /home/XXXXXX/wp-includes/class-wp-hook.php(288): BuddyPress_LearnDash_Loader->user_update_course_access(15, 2158, NULL, false)#2 /home/XXXXXX/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(NULL, Array)#3 /home/XXXXXX/wp-includes/plugin.php(478): WP_Hook->do_action(Array)#4 /home/XXXXXX/wp-content/plugins/sfwd-lms/includes/course/ld-course-functions.php(736): do_action('learndash_updat...', 15, 2158, NULL, false)#5 /home/XXXXXX/wp-content/plugins/learndash-stripe/includes/class-stripe-checkout-integration.php(502): ld_update_course_a in /home/XXXXXX/wp-content/plugins/buddypress-learndash/includes/bp-learndash-functions.php on line 701
Any help would be greatly appreciated.