Tried upgrading to WordPress 6.4 and immediately got this error.
This is with Simplepress Version 6.10.4
[07-Nov-2023 23:16:57 UTC] PHP Fatal error: Uncaught Error: Call to undefined function mysql_real_escape_string() in /home/customer/www/geeksontour.com/public_html/wp-content/plugins/simplepress/sp-api/sp-api-class-spcfilters.php:90
Stack trace: 0 /home/customer/www/geeksontour.com/public_html/wp-content/plugins/simplepress/sp-api/sp-api-class-spcfilters.php(78): spcFilters->do_esc_sql(‘topic subscript…’) 1 /home/customer/www/geeksontour.com/public_html/wp-content/plugins/simplepress/sp-api/sp-api-class-spcsavefilters.php(493): spcFilters->esc_sql(‘topic subscript…’) 2 /home/customer/www/geeksontour.com/public_html/wp-content/plugins/simplepress/sp-api/sp-api-class-spcsavefilters.php(108): spcSaveFilters->escape(‘topic subscript…’) 3 /home/customer/www/geeksontour.com/public_html/wp-content/plugins/simplepress/sp-api/sp-api-class-spcactivity.php(115): spcSaveFilters->title(‘topic subscript…’) 4 /home/customer/www/geeksontour.com/public_html/wp-content/sp-resources/forum-plugins/subscriptions/sp-subscriptions-plugin.php(22): spcActivity->ge in /home/customer/www/geeksontour.com/public_html/wp-content/plugins/simplepress/sp-api/sp-api-class-spcfilters.php on line 90
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