<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 5.15.4

Error message:
Invalid access to memory.

Stack trace:
(006C708F) _sk_addr_free
(00928272) C5157_3
(0092A2DA) ____ExceptionHandler
(00927094) __ExceptionHandler
(00087D6F) ntdll.dll
(00073211) ntdll.dll.KiUserExceptionDispatcher
(006C7AC9) _sk_newlistener
(00698AA2) C2539_0
(00698CB6) _ssh_connshare_log
(006C7B15) _sk_newlistener
(0068ABAD) _run_toplevel_callbacks
(007968E9) TSecureShell::Idle
(008133D3) TTerminal::Idle
(000AEB50) TTerminalManager::Idle
(00018862) TCustomScpExplorerForm::Idle
(000482C7) TNonVisualDataModule::DoIdle
(00048284) TNonVisualDataModule::SessionIdleTimerTimer
(003A3E28) System::Classes::_18201
(000436C9) USER32.dll
(000250B7) USER32.dll
(00024209) USER32.dll
(00023FCB) USER32.dll.DispatchMessageW

(009288DD) C5157_3
(00929EB7) _ReThrowException
(000AEB95) TTerminalManager::Idle
(00018862) TCustomScpExplorerForm::Idle
(000482C7) TNonVisualDataModule::DoIdle
(00048284) TNonVisualDataModule::SessionIdleTimerTimer
(003A3E28) System::Classes::_18201
(000436C9) USER32.dll
(000250B7) USER32.dll
(00024209) USER32.dll
(00023FCB) USER32.dll.DispatchMessageW

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.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.15.1

Error message:
Invalid access to memory.

Stack trace:
(006C53DF) _sk_addr_free
(0092636E) C5153_3
(009283D6) ____ExceptionHandler
(00925190) __ExceptionHandler
(00083FFF) ntdll.dll
(00071931) ntdll.dll.KiUserExceptionDispatcher
(006C5E19) _sk_newlistener
(00696E02) C2535_0
(00697016) _ssh_connshare_log
(006C5E65) _sk_newlistener
(00688F0D) _run_toplevel_callbacks
(00794AAD) TSecureShell::Idle
(0081161F) TTerminal::Idle
(0074AF3B) TTerminalItem::Idle
(0074A2CF) TTerminalQueue::Idle
(000AE7C5) TTerminalManager::Idle
(00018886) TCustomScpExplorerForm::Idle
(00048223) TNonVisualDataModule::DoIdle
(000481E0) TNonVisualDataModule::SessionIdleTimerTimer
(003A346C) System::Classes::_18201
(00045359) USER32.dll
(00036297) USER32.dll
(000353D6) USER32.dll
(000351AB) USER32.dll.DispatchMessageW

(006C53DF) _sk_addr_free
(0092636E) C5153_3
(009283D6) ____ExceptionHandler
(00925190) __ExceptionHandler
(00083FFF) ntdll.dll
(00071931) ntdll.dll.KiUserExceptionDispatcher
(006C5E19) _sk_newlistener
(00696E02) C2535_0
(00697016) _ssh_connshare_log
(006C5E65) _sk_newlistener
(00688F0D) _run_toplevel_callbacks
(00794AAD) TSecureShell::Idle
(0081161F) TTerminal::Idle
(000AE79C) TTerminalManager::Idle
(00018886) TCustomScpExplorerForm::Idle
(00048223) TNonVisualDataModule::DoIdle
(000481E0) TNonVisualDataModule::SessionIdleTimerTimer
(003A346C) System::Classes::_18201
(00045359) USER32.dll
(00036297) USER32.dll
(000353D6) USER32.dll
(000351AB) USER32.dll.DispatchMessageW

(009269D9) C5153_3
(00927FB3) _ReThrowException
(000AE7E1) TTerminalManager::Idle
(00018886) TCustomScpExplorerForm::Idle
(00048223) TNonVisualDataModule::DoIdle
(000481E0) TNonVisualDataModule::SessionIdleTimerTimer
(003A346C) System::Classes::_18201
(00045359) USER32.dll
(00036297) USER32.dll
(000353D6) USER32.dll
(000351AB) USER32.dll.DispatchMessageW

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.)>
Reconnect after hibernate.
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.13.7

Error message:
Invalid access to memory.

Stack trace:
(00672E0F) _sk_addr_free
(008BF00E) C5105_0
(008C1076) ____ExceptionHandler
(008BDE30) __ExceptionHandler
(0007DABF) ntdll.dll
(0006B6E1) ntdll.dll.KiUserExceptionDispatcher
(00673849) _sk_newlistener
(006448B6) C2486_0
(00644ACA) _ssh_connshare_log
(00673895) _sk_newlistener
(00636A11) _run_toplevel_callbacks
(00739CF3) TSecureShell::WaitForData
(00734E85) TSecureShell::Init
(0073475A) TSecureShell::Open
(0077EE2F) TSFTPFileSystem::Open
(007B8F9F) TTerminal::Reopen
(006F3BBD) TTerminalThread::TerminalReopenEvent
(006EEBC4) TSignalThread::Execute
(000A3CDB) Userinterface::C20_0
(00017482) KERNEL32.DLL.BaseThreadInitThunk
(0006202A) ntdll.dll.RtlValidSecurityDescriptor
(00061FF5) ntdll.dll.RtlValidSecurityDescriptor
Authentication log (see session log for details):
Using username "lennarn".

Authentication failed.

The problem happens rarely. I cannot reproduce it.