3510098 - "500 Internal Server Error" "Dereferencing of the NULL reference" error 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" "Exception CX_SY_REF_IS_INITIAL occurred because of error: Dereferencing of the NULL reference (Message E WEBDYNPRO_RT 007)" error message in your Fiori Launchpad.

In transaction ST22 you get a related dump as well, that looks like the following:

Category               ABAP programming error
Runtime Errors         OBJECTS_OBJREF_NOT_ASSIGNED
Except.                CX_SY_REF_IS_INITIAL
ABAP Program           CL_FPM_BICS_GRID_UIBB_RENDER==CP
Application Component  BW-RUI-FPM

SAP S/4HANA Finance for Group Reporting

CX_SY_REF_IS_INITIAL, 500 Internal Server Error, Dereferencing of the NULL reference, WEBDYNPRO_RT 007, Group Reporting, Group Data Analysis, Group Data analysis with Reporting Rules, W0135, W0136, OBJECTS_OBJREF_NOT_ASSIGNED, CL_FPM_BICS_GRID_UIBB_RENDER==CP , KBA , FIN-CS-EA , Embedded Analytics for S/4Hana Finance for Group Reporting , BW-RUI-FPM , FPM Analytical GUIBB , Known Error