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Hi
I switched from PHP 7.4 to 8.1 and there were errors in debug.log
[25-Jul-2024 19:23:06 UTC] PHP Deprecated: preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in .../public_html/wp-admin/includes/plugin.php on line 2161
[25-Jul-2024 19:23:06 UTC] PHP Deprecated: strip_tags(): Passing null to parameter #1 ($string) of type string is deprecated in .../public_html/wp-admin/admin-header.php on line 36
Errors appear exactly when I view emails through your plugin.
Sorry for my English.