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Warning: key_exists() expects parameter 2 to be array, null given in...

I just duplicated a section in my home page and changed it slightly, but now I am getting this error at the bottom of the home page: 

Warning: key_exists() expects parameter 2 to be array, null given in /homepages/35/d438590405/htdocs/clickandbuilds/UpholsterySkillsOnline/wp-content/themes/betheme/functions/builder/class-mfn-builder-front.php on line 130

And this is repeated for lines 163, 169, 233, 251, 272, 278, 284 and 496, as you can see at the bottom of this page:

This happened earlier so I updated Betheme, but that doesn't fix it. It fixes when I delete the copied section though. How can I fix this?
Thank you


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