Ogiltig åtkomst till minnet - Vcl::Forms::TApplication::ProcessMessage

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.9.6

Error message:
Ogiltig åtkomst till minnet.

Stackspår:
(000A50FF) ntdll.dll
(000932B1) ntdll.dll.KiUserExceptionDispatcher
(0000BB66) tv_w32.dll
(000000EF)tv_w32.dll
(00035355) USER32.dll
(0001969D) USER32.dll
(00019419) USER32.dll
(0002299D) USER32.dll
(0009326B) ntdll.dll.KiUserCallbackDispatcher
(0003D74E) UXTHEME.DLL
(0003D720) UXTHEME.DLL
(0003D6D4) UXTHEME.DLL
(0003D63C) UXTHEME.DLL
(0001CB51) USER32.dll
(0002A656) USER32.dll.EnumDesktopWindows
(0003D9B4) UXTHEME.DLL
(000272FA) USER32.dll.EnumDesktopsW
(00027240) USER32.dll.EnumDesktopsW
(0003D818) UXTHEME.DLL
(0003D7B0) UXTHEME.DLL
(0002A47A) USER32.dll
(0009326B) ntdll.dll.KiUserCallbackDispatcher
(0001497F) USER32.dll.PeekMessageW
(00212F30) Vcl::Forms::TApplication::ProcessMessage
(000D7FC3) Execute
(000024A8) wWinMain
(008669E1) __wstartup
(00069C99) ntdll.dll.RtlCheckRegistryKey
(00069C6A) ntdll.dll.RtlCheckRegistryKey

The problem happens rarely. I cannot reproduce it.