When I try to use the automatic bug submission form, the forum tells me "Sorry, but this username has been disallowed." for some reason, so I'm posting this manually with my existing forum account.

"The problem happens rarely. I cannot reproduce it."

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
A WinSCP session/connection was active when I closed the lid (system went to standby) and reopened it. I got the error when I tried to terminate the WinSCP session.
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.13.5

Error message:
Invalid access to memory.

Stack trace:
(003F2A9F) System::DoneExcept
(0003EF0E) ntdll.dll.ZwWow64CallFunction64
(0003F68A) ntdll.dll.KiUserExceptionDispatcher
(00380EE0) System::Classes::_18201
(00007E6F) USER32.DLL.CallNextHookEx
(000080CC) USER32.DLL
(0000966A) USER32.DLL
(000096DB) USER32.DLL.DispatchMessageW

(003F268C) System::HandleAnyException
(0003EF0E) ntdll.dll.ZwWow64CallFunction64
(0003F68A) ntdll.dll.KiUserExceptionDispatcher
(00380EE0) System::Classes::_18201
(00007E6F) USER32.DLL.CallNextHookEx
(000080CC) USER32.DLL
(0000966A) USER32.DLL
(000096DB) USER32.DLL.DispatchMessageW

Status: all_insignificant