PVS-Studio warning V575 for ReactOS

BOOL GetEventCategory(....)
{
  ....
  if (lpMsgBuf)
  {
    ....
  }
  else
  {
    wcscpy(CategoryName, (LPCWSTR)lpMsgBuf);
  }
  ....
}

This suspicious code was found in ReactOS project by PVS-Studio static code analyzer.
Warning message is:
V575 The null pointer is passed into 'wcscpy' function. Inspect the second argument. eventvwr.c 270

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/