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Hello Martin,
This is related to the Pro version. I don’t know if it’s also relevant for the free version.
The Plugin Update Checker, a third-party lib you are using, is causing an issue. It might need updating. Latest Puc Version is 5.4
Deprecated: Creation of dynamic property Puc_v4p11_Plugin_Info::$message is deprecated in
{site_path}/wp-content/plugins/custom-admin-interface-pro/inc/library/plugin-update-checker/Puc/v4p11/Metadata.php on line 47
Deprecated: Creation of dynamic property Puc_v4p11_Plugin_Info::$request_time_elapsed is deprecated in {site_path}/wp-content/plugins/custom-admin-interface-pro/inc/library/plugin-update-checker/Puc/v4p11/Metadata.php on line 47
Regards