Error on site after update

The latest update appears to be breaking our site.

An error of type E_ERROR was caused in line 2549 of the file /public_html/wp-content/plugins/mage-eventpress/inc/mep_functions.php. Error message: Uncaught TypeError: array_values(): Argument #1 ($array) must be of type array, string given in /public_html/wp-content/plugins/mage-eventpress/inc/mep_functions.php:2549 Stack trace: #0 /public_html/wp-content/plugins/mage-eventpress/inc/mep_functions.php(2549): array_values() #1 /public_html/wp-content/plugins/mage-eventpress/inc/mep_functions.php(1105): mep_ticket_type_sold() #2 /public_html/wp-content/plugins/mage-eventpress/inc/mep_functions.php(1061): mep_get_count_total_available_seat() #3 /public_html/wp-content/plugins/mage-eventpress/inc/mep_functions.php(1086): mep_update_event_total_seat() #4 /public_html/wp-content/plugins/mage-eventpress/inc/mep_functions.php(2450): mep_get_event_total_seat_left() #5 /public_html/wp-content/plugins/mage-eventpress/inc/mep_functions.php(2517): mep_get_event_total_seat() #6 /public_html/wp-includes/class-wp-hook.php(308): mep_mep_events_column() #7 /public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters() #8 /public_html/wp-includes/plugin.php(517): WP_Hook->do_action() #9 /public_html/wp-admin/includes/class-wp-posts-list-table.php(1363): do_action() #10 /public_html/wp-admin/includes/class-wp-list-table.php(1532): WP_Posts_List_Table->column_default() #11 /public_html/wp-admin/includes/class-wp-posts-list-table.php(1397): WP_List_Table->single_row_columns() #12 /public_html/wp-admin/includes/class-wp-posts-list-table.php(807): WP_Posts_List_Table->single_row() #13 /public_html/wp-admin/includes/class-wp-posts-list-table.php(783): WP_Posts_List_Table->_display_rows() #14 /public_html/wp-admin/includes/class-wp-list-table.php(1444): WP_Posts_List_Table->display_rows() #15 /public_html/wp-admin/includes/class-wp-list-table.php(1371): WP_List_Table->display_rows_or_placeholder() #16 /public_html/wp-admin/edit.php(487): WP_List_Table->display() #17 {main} thrown