Functional |Any company | Employee Change status | We are not able to change employee status

Environment : LB

• Login as partner
• Select company > search Employee > Go to change status>
• Change employee status from Active to Terminated
• Enter Status change date
• click on save

Actual Result : We are getting server error while changing employee status .
Expected result : Server error should not populate

Error Log :
ErrorID : 0
ErrorSource : ControllerAppTier.Save->WORKTERRAControllerAppTier.Save->Employee.Save->Employee.UpdateEmployeeChangeStatus->Employee.GetEffectiveDateForEnrollmentMode
ErrorMessage: Conversion from type 'DBNull' to type 'Date' is not valid.

CC- Rakesh Roy Sachin Hingole Smita Pawar