3508966 - "500 Internal Server Error" "Access using a 'ZERO' object reference is not possible." when using the Group Data Analysis or Group Data Analysis with Reporting Rules apps

When you open/use the Group Data Analysis (App ID: W0135) or the Group Data Analysis with Reporting Rules (App ID: W0136) apps you get an "500 Internal Server Error" "Access using a 'ZERO' object reference is not possible." error message in your Fiori Launchpad.

Also, in your backend system, in transaction ST22, you get an ABAP dump like below.
 
Category               ABAP programming error
Runtime Errors         OBJECTS_OBJREF_NOT_ASSIGNED
ABAP Program           CL_RSR_CDS_EXIT_VARIABLE======CP
Application Component  BW-BEX-OT

SAP S/4HANA Group Reporting

Group Reporting, Group Data Analysis, Group Data Analysis with Reporting Rules, query, 500 Internal Server Error, OBJECTS_OBJREF_NOT_ASSIGNED, CL_RSR_CDS_EXIT_VARIABLE======CP, W0135, W0136 , KBA , FIN-CS-EA , Embedded Analytics for S/4Hana Finance for Group Reporting , BW-BEX-OT-ODP , Query Runtime for Operational Data Provisioning , Known Error