Hi @karengeier,

I hope you are well today and thanks for posting here.

This is a simple PHP warning/notice and most of the time it doesn’t affect functionality of site so it is nothing to worry about!

Do you have WP_DEBUG set to true in your wp-config.php file?

If you do then please set it to false.
This will hide the warning messages and you will be able to use your site normally.

Best regards,
Shufflehound team