Invalid access to memory

E: drive is a DVD drive in a Dell PC running Windows 10. This only happens overnight while the PC is locked, but not logged out.

<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 5.8.2

Error message:
Invalid access to memory.

Stack trace:
(0026A074)
(0008137F) ntdll.dll
(0006EF1A) ntdll.dll.KiUserExceptionDispatcher
(0040249F)
(0035A970)
(0002C271) USER32.dll
(0000D845) USER32.dll
(0000D19F) USER32.dll
(0001B35B) USER32.dll
(0001B18B) USER32.dll
(0001AD6D) USER32.dll.DialogBoxIndirectParamAorW
(0001AD26) USER32.dll.DialogBoxIndirectParamW
(00189D91) COMCTL32.DLL
(000D2EC9) COMCTL32.DLL
(000D3A31) COMCTL32.DLL.TaskDialogIndirect
(00317F4E)
(0021D611)
(0021D919)
(0021F212)
(0021EB9E)
(0040345A)
(0026D6BA)
(003F4285)
(00236A39)
(0026D9DE)
(00236B9F)
(00236A39)
(00236080)
(0035A970)
(0002C271) USER32.dll
(0000D845) USER32.dll
(0000D47B) USER32.dll
(00017AD7) USER32.dll
(0006EEF4) ntdll.dll.KiUserCallbackDispatcher
(0000FBCB) USER32.dll.SendMessageW
(000638A8) COMCTL32.DLL
(0002279B) COMCTL32.DLL
(0002250D) COMCTL32.DLL
(00020DB1) COMCTL32.DLL
(0002C271) USER32.dll
(0000D845) USER32.dll
(0000CED2) USER32.dll.CallWindowProcW
(00236B4A)
(00236A39)
(0026D9DE)
(0035A970)
(0002C271) USER32.dll
(0000D845) USER32.dll
(0000CED2) USER32.dll.CallWindowProcW
(004140CB)
(0035A970)
(0002C271) USER32.dll
(0000D845) USER32.dll
(0000D47B) USER32.dll
(00017AD7) USER32.dll
(0006EEF4) ntdll.dll.KiUserCallbackDispatcher
(0000FBCB) USER32.dll.SendMessageW
(00317EAF)
(004066C0)
(00404278)
(004

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.