Hi, I'm having trouble with the changes saving on my site. I checked with my server and the issues are not on their end. They are reporting this issue:
[21-May-2019 22:40:18 UTC] PHP Warning: key_exists() expects parameter 2 to be array, null given in /home/powerteamwebcot/girlwithwanderlust.com/wp-content/themes/betheme/functions/builder/class-mfn-builder-front.php on line 492
Can you assist with this? They said to reach out to the theme developer. Thank you

Comments
Please provide us with your hosting environment settings, to do that please follow these steps:
1) Go to the Wordpress > Tools > Site Health [Links visible only for registered users]
2) Click at the “Info” on the top of the page and open the “Server” tab [Links visible only for registered users]
3) Take a screenshot of the content inside that ‘Server’ tab [Links visible only for registered users]
Please make sure you are using Wordpress 5.2 or later, previous versions did not have this option built in.
Please use snag.gy or pasteboard.co to host the screenshot and send us the link to it.
Notice!
1. Attach your license key and the WordPress admin login credentials.
2. Send a link to this discussion, so the email support knows where to look.
Thanks