Date constraint window doesn't close if table name is undefined

Occasionally the date constraint window doesn't close when a user clicks on the OK button in the dialog.

The following is from Andrew Vallejos:

After looking around the code I found the error occured around line 435 of CRC_ctrlr_Dates.js. For some reason the table_name is sometimes undefined, which causes the javascript to error. I did a small workaround by checking to make sure table_name is defined.
 
   if(typeof(table_name) != "undefined" && table_name.toLowerCase() == 'patient_dimension'){
 
That seemed to solve the problem. Any ideas why sometimes the table_name would sometimes be undefined?