I just tried to reconnect to a session that goes through an SSH tunnel (after a few hours of the computer being in hibernation). This happened (I think) after giving my credentials for both.

Good luck :)

WinSCP 5.9.3

Error message:
Invalid access to memory.

Stack trace:
(003E0FA4) System::SysFreeMem
(00866422) C5073_3
(0086848A) ____ExceptionHandler
(00865244) __ExceptionHandler
(000624F6) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(00853E57) _free
(00615B87) _safefree
(00615FD7) C2443_0
(0061689E) _pfd_close
(00624FCF) _ssh_sharing_logf
(0061D203) C2447_0
(0061D3E6) _ssh_connshare_log
(0064BA7D) _sk_newlistener
(0060F49D) _run_toplevel_callbacks
(006FF239) TSecureShell::Idle
(0076EEFF) TTerminal::Idle
(0008EE20) TTerminalManager::Idle
(00016C9F) TCustomScpExplorerForm::Idle
(0003CF87) TNonVisualDataModule::DoIdle
(0003CF44) TNonVisualDataModule::SessionIdleTimerTimer
(00373100) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167BF) USER32.dll
(00016885) USER32.dll.DispatchMessageW

(00866A8D) C5073_3
(00868067) _ReThrowException
(0008EE65) TTerminalManager::Idle
(00016C9F) TCustomScpExplorerForm::Idle
(0003CF87) TNonVisualDataModule::DoIdle
(0003CF44) TNonVisualDataModule::SessionIdleTimerTimer
(00373100) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167BF) USER32.dll
(00016885) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.