Key exist error

Hello Pablo,
I have a problem.. I have a website. 

in this page i have an error message.

Warning: key_exists() expects parameter 2 to be array, null given in /home/modyas/public_html/wp-content/themes/betheme/functions/builder/front.php on line 123 
and more lines

 I can't add one more photo. If i delete last image, there is no problem. But if add one more image box i see this error. I want to add 7 images more.

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