Invalid access to memory

Restart after windows update

WinSCP 6.1.1

Error message:
Invalid access to memory.

Stack trace:
(003F90F7)
(000987BF) ntdll.dll
(00077E51) ntdll.dll.KiUserExceptionDispatcher
(00480368)
(00492ADE)
(0047FFF9)
(003CCDAF)
(00214D98)
(00032451) USER32.dll
(000232A1) USER32.dll
(00021B60) USER32.dll
(000216AB) USER32.dll.DispatchMessageW

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.