Error while saving page after upgrading to php 7.2

Hi there, 

Since php 5.6 is going to End of Life (EOL). I need to upgrade my server to php 7.2 but after upgrading to php 7.2 I am unable to save any changes I made to a page using page buildier. I look in to error log and I see below:

the function in portfolio.php on line 460 is not compatible with PHP 7.2
The function is called in mfn_builder_save()
this is what the stack trace said "themes/betheme/functions/meta-portfolio.php(460): mfn_builder_save()"

Would you please tell me how can I fix that?

looking forward for your reply.
thanks & regards

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