I get a fatal error when I try to access payment stats as an administrator

there is a bug in the post pay counter plugin that relates to php80 – I’ve reverted site back to php74 again – but this needs to be resolved by the plugin developers asap – php74 will NOT be supported by most serious plugin developers in the near future. Here is the error code
[20-Mar-2023 08:44:21 UTC] PHP Fatal error: Uncaught TypeError: Unsupported operand types: string + string in /home/runcloud/webapps/app-ofp202302/wp-content/plugins/post-pay-counter-pro/classes/ppcp_general_functions_class.php:160
Stack trace:
#0 /home/runcloud/webapps/app-ofp202302/wp-content/plugins/post-pay-counter-pro/classes/ppcp_stats_class.php(139): PPCP_general_functions::get_paid_total()
#1 /home/runcloud/webapps/app-ofp202302/wp-includes/class-wp-hook.php(308): PPCP_stats::get_author_due_payment()
#2 /home/runcloud/webapps/app-ofp202302/wp-includes/plugin.php(205): WP_Hook->apply_filters()
#3 /home/runcloud/webapps/app-ofp202302/wp-content/plugins/post-pay-counter/classes/ppc_generate_stats_class.php(301): apply_filters()
#4 /home/runcloud/webapps/app-ofp202302/wp-content/plugins/post-pay-counter/classes/ppc_generate_stats_class.php(56): PPC_generate_stats::calculate_total_stats()
#5 /home/runcloud/webapps/app-ofp202302/wp-content/plugins/post-pay-counter/post-pay-counter.php(633): PPC_generate_stats::produce_stats()
#6 /home/runcloud/webapps/app-ofp202302/wp-content/plugins/post-pay-counter/post-pay-counter.php(270): post_pay_counter->initialize_stats()
#7 /home/runcloud/webapps/app-ofp202302/wp-includes/class-wp-hook.php(308): post_pay_counter->on_load_stats_page()
#8 /home/runcloud/webapps/app-ofp202302/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()
#9 /home/runcloud/webapps/app-ofp202302/wp-includes/plugin.php(517): WP_Hook->do_action()
#10 /home/runcloud/webapps/app-ofp202302/wp-admin/admin.php(237): do_action()
#11 {main}
thrown in /home/runcloud/webapps/app-ofp202302/wp-content/plugins/post-pay-counter-pro/classes/ppcp_general_functions_class.php on line 160