Dumps on SAP : OBJECTS_OBJREF_NOT_ASSIGNED_NO CX_SY_REF_IS_INITIAL

Dear Team,

I found this dumps recurrent in our production Env

all dumps are generated y one user, but never connected on the systems

dump details

Category               ABAP Programming Error

Runtime Errors         OBJECTS_OBJREF_NOT_ASSIGNED_NO

Except.                CX_SY_REF_IS_INITIAL

ABAP Program           /MRSS/CL_SGE_ASSIGNMENT_MGR===CP

Application Component  PM-WOC-MO

Date and Time          18.01.2016 14:41:52

Short Text

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

What happened?

     Error in the ABAP Application Program

     The current ABAP program "/MRSS/CL_SGE_ASSIGNMENT_MGR===CP" had to be

      terminated because it has

     come across a statement that unfortunately cannot be executed.

What can you do?

    Note down which actions and inputs caused the error.

    To process the problem further, contact you SAP system

    administrator.

    Using Transaction ST22 for ABAP Dump Analysis, you can look

    at and manage termination messages, and you can also

    keep them for a long time.

Error analysis

    An exception has occurred which is explained in more detail below. The

    exception is assigned to class 'CX_SY_REF_IS_INITIAL' and was not caught in

     procedure

    "BUILD" "(METHOD)", nor was it 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 is:

    You are trying to access a component with a 'ZERO' object reference

    (points to 'nothing').

    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.

kernel version 741 SP 223

EHP 7

Thank you for you help