Invalid access to memory

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WinSCP 5.13.1

Error message:
Invalid access to memory.

Stack trace:
(007CB698)
(00088D1F) ntdll.dll
(0006FC11) ntdll.dll.KiUserExceptionDispatcher
(006B6B24)
(0000D766)
(0000F28B)
(0000F4B4)
(0000F53B)
(0003ECE8)
(0037ED60)
(0001D0B9) USER32.dll
(00027844) USER32.dll
(0002A140) USER32.dll
(000180D7) USER32.dll
(00017C1B) USER32.dll.DispatchMessageW

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.