onSubmit script error when attempting to save a case

Users encounter an onSubmit script error when attempting to save a form. In this scenario, the error arises in the Case form.

onSubmit script error: TypeError: Cannot read property 'display' of undefined:
function(){
return GwtListEditor._editListOnSubmitWrapper(listID);
}

All releases

Duplicate entries on the question_answer table for the specific record you are trying to save.

1. Check to see if there is a variable editor on the form. 
2. If there is, check to see if the questions are shown more than once. 
3. If so, there are duplicate entries in the question_answer table that need to be removed. 
4. Navigate to the question_answer table and filter on 'table_sys_id' is the sys ID of the form you were trying to save.
5. Remove the duplicate entries.