Joomla Portal error after comment submit {"description":"","notes":[]}

I’m getting the following comment on an otherwise blank page after submitting a comment to a case in my Joomla Portal


The error is on the following page: ?option=com_advancedopenportal&task=addupdate&format=raw

The error occurs if I have no Editor turned on, if I enable tinymce the submit button just hangs(the comment does get lodged in SuiteCRM though.

Has anyone else encountered this?