2950129 - Dump OBJECTS_OBJREF_NOT_ASSIGNED during download a note

During download an SAP Note by SNOTE, below dump happened:

Runtime Errors OBJECTS_OBJREF_NOT_ASSIGNED 
Exception CX_SY_REF_IS_INITIAL 
 
Short Text 
 Access via 'NULL' object reference not possible. 
 
What happened?
 Error in the ABAP Application Program 
 
 The current ABAP program "SAPLSCWU" had to be terminated because it has 
 come across a statement that unfortunately cannot be executed. 
Error analysis
 An exception occurred that is explained in detail below. 
 The exception, which is assigned to class 'CX_SY_REF_IS_INITIAL', was not 
 caught in
 procedure "SCWN_NOTE_STORE" "(FUNCTION)", nor was it propagated by a RAISING
 clause. 
 Since the caller of the procedure could not have anticipated that the 
 exception would occur, the current program is terminated. 
 The reason for the exception is: 
 You attempted to use a 'NULL' object reference (points to 'nothing') 
 access a component (variable: "LR_CWB_DELTA").
 An object reference must point to an object (an instance of a class) 
 before it can be used to access components. 
 Either the reference was never set or it was set to 'NULL' using the 
 CLEAR statement.

SAP NW 7.0, 7.1

OBJECTS_OBJREF_NOT_ASSIGNED , CX_SY_REF_IS_INITIAL , SCWN_NOTE_STORE, SNOTE, download note , KBA , BC-UPG-NA , Note Assistant , Problem