Invalid access to memory - TSecureShell::PoolForData

<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 6.5.6

Error message:
Invalid access to memory.

Stack trace:
(00C9C576) TSecureShell::PoolForData
(000B418F) ntdll.dll
(0007AD8A) ntdll.dll.KiUserExceptionDispatcher
(00C9C818) TPoolForDataEvent::PoolForData
(00204C90) System::Classes::_18364
(00038731) USER32.dll
(000278B8) USER32.dll
(00026885) USER32.dll
(000263EB) USER32.dll.DispatchMessageW

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.

@neil_foz: Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.