Runtime Error on client exit

In some computers the following error message frequently appears in the moment of closing the client application:

Window title: "Microsoft Visual C++ Runtime Library error", and contents:

Window content:
"Runtime error.
Program: C:\Users\...
R6025
- pure virtual function call".

User claims that the error started to appear after upgrading Webissues client to 1.1.
There is no known effect of this error (i.e. except from the error message application closes normally).