We've been notified by several users that during our checkout process (that links to CMCMailchimp and adds the user to mailchimp newsletter automatically) of this error:
0 Argument 2 passed to CmcHelperChimp:roudctExists() must be an instance of CmcMailChimpProduct, string given, called in /administrator/components/com_cmc/help on line 426
I have tried several times to replicate the error but can't replicate. Can you help?