What does this warning mean

Hi @wordpressrun, thanks for getting in touch.

Where in Wordfence is this showing up? This is a PHP warning for a function in the Divi theme/builder so could be shown to you if you have error reporting visible, or you’re using a tool like Query Monitor that shows you possible errors going on inside your site. As this is a PHP Warning, it’s non-fatal and shouldn’t affect any operations on your site, but it could be worth asking Divi support if they know what it might mean or why it might occur.

Thanks,
Peter.