CoursePress Pro Multiple choice Questions save issue

When trying to save a Multiple choice questions we get this error:

Warning: Invalid argument supplied for foreach() in /home/thenewhu/public_html/wp-content/plugins/coursepress/includes/unit-modules/checkbox_input.php on line 257

there were answers in there before the save and error.

I updated this morning to the new version which fixed some issue but then this popped up.