null variable on /www/wp-content/themes/jupiterx/lib/api/custom-fields/functions

An user reported to us a crash https://www.ads-software.com/support/topic/e_error-was-caused-in-line-97-of-the-file-www-acf-php/#post-14123553

The issue is generated by this theme that doesn’t follow the ACF code, as that filter expect a string instead is returned a null, so I had to patch our plugin to not do type cast of the variables.