I get this issue when merging forum threads using bbPress. While the action=merge is included in the URL, if I remove it, then I cannot complete the desired action.
WordPress 5.3.2
PHP 7.3.14
bbPress 2.6.4
“aioseop_module_class.php” is a file, not a screen. You will need to go into your file manager, locate this file, edit line 612 and resave it. The file should be in your folder /public_html/wp-content/plugins/all-in-one-seo-pack/.
Got it. Thank you very much, Peter.