Invalid access to memory - Vcl::Comctrls::TListItem::SetCaption

<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 6.3.4

Error message:
Invalid access to memory.

Stack trace:
(0044784B) Vcl::Comctrls::TListItem::SetCaption
(00E22DAE) C6612_0
(00E24E16) ____ExceptionHandler
(00E21BD0) __ExceptionHandler
(0008239F) ntdll.dll
(0006FEFA) ntdll.dll.KiUserExceptionDispatcher

(00E23419) C6612_0
(00E2494C) _ThrowExceptionLDTC
(00B2DBF3) RethrowException
(00D1A0AB) TSynchronizeChecklistDialog::Execute
(00D19160) DoSynchronizeChecklistDialog
(000220FB) TCustomScpExplorerForm::DoFullSynchronizeDirectories
(001140AC) FullSynchronize
(0011BF8F) Execute
(000031E3) wWinMain
(00E20B11) C6481_0
(00060CA7) ntdll.dll
(00060C6F) ntdll.dll

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.

@kamishev: 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.