UI Refresh -> Form builder ->Displaying "Server Error " On click of Cancel button on design system messages

Verified on IE11, Mozilla Firefox, Google Chrome
Verified for Partner Login
Replication steps:
1)Login with partner
2)Search and select "UiRefresh_DC_13536" company
3)BenAdmin-> Manage Form-> Form builder-> Select any for Enroll now,Confirmation statement,Demographics
4)Enter details-> Click on cancel button
5)Check for server error and its goes back to form builder page on click of cancel button
Please refer attached screen shot :

Expected Result : System should not display server error on click of cancel button

Actual Result : Displaying "Server Error " On click of Cancel button on design system messages