error in my contact page

Hello dears,

I have this error on my contact page:

Notice: Undefined index: detailttl in ...../public_html/wp-content/themes/hacker/inc/library.php on line 53

How can I solve it please?

Thanks in advance

Regards

Hi!

This is just a notice which we recommend to hide by disabling the WP_DEBUG option inside the wp_config.php file.