Error occurred in system : Dereferencing the NULL reference

Hi All,

When I login to Custom service request screen, it will open Service request search screen as default. Issue is, When I open existing Service request
from recent SR list, and when I click on back button, it is giving dump as below.

• The following error occurred in system DXX : Dereferencing the NULL reference

• The error occurred on application server esesslx0061_F87_02 and in work process. 0

• The termination type was: RABAX_STATE

• The ABAP call stack was:

Please suggest.

Thanks & Regards,

Shaik