3518117 - 500 Internal Server Error received using multidimensional WDA app/report; exception not caught in "UPDATE_BM_COLUMN_WIDTHS" method

The below ST22 dump arises using multidimensional WDA app/report.

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

    Short Text
        Access using a 'ZERO' object reference is not possible.

    What happened?
        Error in the ABAP application program.

        The current ABAP program "CL_FPM_BICS_GRID_UIBB_ASSIST==CP" had to be
         terminated because it found a
        statement that could not be executed.

    What can you do?
        Note which actions and entries caused the error to occur.

        Consult your SAP administrator.

        Using transaction ST22 for ABAP dump analysis, you can view, manage,
        and retain termination messages for longer periods.
        Note which actions and entries caused the error to occur.

        Consult your SAP administrator.

        Using transaction ST22 for ABAP dump analysis, you can view, manage,
        and retain termination messages for longer periods.

    Error analysis
        An exception has occurred in class "CX_SY_REF_IS_INITIAL". This exception was
         not caught
        in procedure "UPDATE_BM_COLUMN_WIDTHS" "(METHOD)" or propagated by a RAISING
         clause.
        Since the caller of the procedure could not have anticipated this
        exception, the current program was terminated.
        The reason for the exception occurring was:
        The reason for the exception is:
        You are trying to access a component with a 'ZERO' object reference
        (points to 'nothing'). Variable: "%_##TVREG_002".
        An object reference must point to an object (an instance of a class)
        before it can be used to access a component. The reference has either
        never been set, or it was set to 'ZERO' with a CLEAR statement.

• ABAP Platform 2021 / 2022 / 2023 (SAP_BW 756 <)
• Web Dynpro ABAP / FPM Analytical GUIBB

500 Internal Server Error, FIORI, WDA, Web Dynpro ABAP, multidimensional report, tile, ABAP programming error, OBJECTS_OBJREF_NOT_ASSIGNED, CX_SY_REF_IS_INITIAL, CL_FPM_BICS_GRID_UIBB_ASSIST==CP, ABAP Platform, SAP_BW, CL_FPM_BICS_GRID_UIBB_ASSIST==CP,         UPDATE_BM_COLUMN_WIDTHS, ST22 , KBA , BW-RUI-FPM , FPM Analytical GUIBB , Problem