Invalid access to memory - TLoginDialog::GenerateImages

<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 5.17.6

Error message:
Invalid access to memory.

Stack trace:
(713B3BB0)WinSCP.exe
(0003EF0E) ntdll.dll.ZwWow64CallFunction64
(0003F68A) ntdll.dll.KiUserExceptionDispatcher
(00DF8E79) TLoginDialog::GenerateImages
(00DF8D8F) TLoginDialog::InitControls
(00DF9123) TLoginDialog::Init
(00DFA8D7) TLoginDialog::FormShow
(00DFCE54) TLoginDialog::Dispatch
(00279E65) Vcl::Controls::TWinControl::WndProc
(0023432C) Vcl::Forms::TCustomForm::WndProc
(00E4159C) Vclcommon::C2992_0

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.

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