Undefined array key

I think you should first check the existence of $_GET array keys before accessing them.

Excerpt from the PHP error log

[Wed Jan 01 23:21:53.271234 2025] [-:error] [pid 67973:tid 36503924736] [client 188.30.83.77:15046] FastCGI: server "/var/run/hcgi/70425" stderr: PHP Warning: Undefined array key "rerror" in /home/stormarc/www/frightanic.com/blog/wp-content/plugins/wp-recaptcha/recaptcha.php on line 291
[Wed Jan 01 23:21:58.501055 2025] [-:error] [pid 67973:tid 36504467200] [client 188.30.83.77:15046] FastCGI: server "/var/run/hcgi/70425" stderr: PHP Warning: Undefined array key "rcommentid" in /home/stormarc/www/frightanic.com/blog/wp-content/plugins/wp-recaptcha/recaptcha.php on line 348
[Wed Jan 01 23:21:58.501124 2025] [-:error] [pid 67973:tid 36504467200] [client 188.30.83.77:15046] FastCGI: server "/var/run/hcgi/70425" stderr: PHP Warning: Undefined array key "rchash" in /home/stormarc/www/frightanic.com/blog/wp-content/plugins/wp-recaptcha/recaptcha.php on line 349
[Wed Jan 01 23:21:58.501131 2025] [-:error] [pid 67973:tid 36504467200] [client 188.30.83.77:15046] FastCGI: server "/var/run/hcgi/70425" stderr: PHP Warning: Undefined array key "rerror" in /home/stormarc/www/frightanic.com/blog/wp-content/plugins/wp-recaptcha/recaptcha.php on line 291
[Wed Jan 01 23:25:53.080512 2025] [-:error] [pid 67989:tid 38535396096] [client 66.249.66.87:63447] FastCGI: server "/var/run/hcgi/70425" stderr: PHP Warning: Undefined array key "rcommentid" in /home/stormarc/www/frightanic.com/blog/wp-content/plugins/wp-recaptcha/recaptcha.php on line 348
[Wed Jan 01 23:25:53.080571 2025] [-:error] [pid 67989:tid 38535396096] [client 66.249.66.87:63447] FastCGI: server "/var/run/hcgi/70425" stderr: PHP Warning: Undefined array key "rchash" in /home/stormarc/www/frightanic.com/blog/wp-content/plugins/wp-recaptcha/recaptcha.php on line 349
[Wed Jan 01 23:25:53.080582 2025] [-:error] [pid 67989:tid 38535396096] [client 66.249.66.87:63447] FastCGI: server "/var/run/hcgi/70425" stderr: PHP Warning: Undefined array key "rerror" in /home/stormarc/www/frightanic.com/blog/wp-content/plugins/wp-recaptcha/recaptcha.php on line 291

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