This was an issue until several months ago. Not sure if I con go ahead and update to whatever the latest version of 7 is?
If that helps, I run X - the Theme on PHP 7.0.18-0ubuntu0.16.04.1 (cli) ( NTS ) and it appears to work fine… (I am just a user, not support)
Thanks! I updated and all working normally
Thanks! All working fine after update.
Glad to hear that. 
why am I getting this warning?

FILE: /home/velocjb2/public_html/velocity-blue.com/wp-content/plugins/cornerstone/includes/utility/jsqueeze.php
FOUND 3 ERRORS AFFECTING 3 LINES
387 | ERROR | preg_replace() - /e modifier is deprecated since PHP 5.5 and removed since PHP 7.0
465 | ERROR | preg_replace() - /e modifier is deprecated since PHP 5.5 and removed since PHP 7.0
480 | ERROR | preg_replace() - /e modifier is deprecated since PHP 5.5 and removed since PHP 7.0
FILE: /home/velocjb2/public_html/velocity-blue.com/wp-content/themes/x/woocommerce/cart/cross-sells.php
FOUND 1 ERROR AFFECTING 1 LINE
26 | ERROR | Using a call-time pass-by-reference is deprecated since PHP 5.3 and prohibited since PHP 5.4
Hi @VelocityWeb,
Thanks for writing back! Can you confirm that you are fully updated? (Theme and Plugins)
You can find the latest version numbers here: (http://theme.co/changelog/) Then you can compare them to what’s installed on your site.
If you find anything to be out of date, you can review our update guide.