Invalid argument for foreach() line 65

I raised this problem (different line number) six months ago but the topic was closed with no reply. The warning is:

Apr 18, 16:17:22

Warning: Invalid argument supplied for foreach( ) in /wp-content /plugins /gravity-forms-custom-post-types /gfcptaddonbase .php on line 65

Can you tell me how to identify what gravity form number is raising this warning?