<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 6.3.5

Error message:
Invalid access to memory.

Stack trace:
(00B807A8) UnixIncludeTrailingBackslash
(00E24572) C6612_0
(00E265DA) ____ExceptionHandler
(00E23394) __ExceptionHandler
(00098E2F) ntdll.dll
(00078201) ntdll.dll.KiUserExceptionDispatcher
(00B8A766) TRemoteFileList::GetFullDirectory
(00B8A1E4) TRemoteFile::GetFullFileName
(00B86615) TRemoteFile::Duplicate
(00B8A576) TRemoteFileList::CloneStrings
(00011FB9) TCustomScpExplorerForm::ExecuteCopyMoveFileOperation
(00012B5C) TCustomScpExplorerForm::ExecuteFileOperation
(00012DD8) TCustomScpExplorerForm::ExecuteFileOperation
(000269FB) TCustomScpExplorerForm::RemoteFileControlFileOperation
(00026E31) TCustomScpExplorerForm::RemoteFileControlDDEnd
(0048ECB6) Customdirview::TCustomDirView::DDDragDetect
(00AEA9AA) TUnixDirView::DDDragDetect
(0048AE46) Custom

The problem happens rarely. I cannot reproduce it.

@
Error message:
Invalid access to memory.

Stack trace:
(00B7F140) UnixIncludeTrailingBackslash
(00E22DAE) C6612_0
(00E24E16) ____ExceptionHandler
(00E21BD0) __ExceptionHandler
(00098CCF) ntdll.dll
(000781E1) ntdll.dll.KiUserExceptionDispatcher
(00B890FE) TRemoteFileList::GetFullDirectory
(00B88AE3) TRemoteFile::GetFullFileName
(00B84FAD) TRemoteFile::Duplicate
(00B88F0E) TRemoteFileList::CloneStrings
(00011FB9) TCustomScpExplorerForm::ExecuteCopyMoveFileOperation
(00012B5C) TCustomScpExplorerForm::ExecuteFileOperation
(00012DD8) TCustomScpExplorerForm::ExecuteFileOperation
(00012F97) TCustomScpExplorerForm::ExecuteFileOperationCommand
(0004FC26) TNonVisualDataModule::ExplorerActionsExecute
(002757CC) System::Actions::TContainedActionList::ExecuteAction
(003595AD) Vcl::Actnlist::TCustomAction::Execute
(00226F2C) System::Classes::_18201
(000326D1) USER32.dll
(000234E1) USER32.dll
(00021DA0) USER32.dll
(000218EB) USER32.dll.DispatchMessageW

(00E23419) C6612_0
(00E249F3) _ReThrowException
(00B8500A) TRemoteFile::Duplicate
(00B88F0E) TRemoteFileList::CloneStrings
(00011FB9) TCustomScpExplorerForm::ExecuteCopyMoveFileOperation
(00012B5C) TCustomScpExplorerForm::ExecuteFileOperation
(00012DD8) TCustomScpExplorerForm::ExecuteFileOperation
(00012F97) TCustomScpExplorerForm::ExecuteFileOperationCommand
(0004FC26) TNonVisualDataModule::ExplorerActionsExecute
(002757CC) System::Actions::TContainedActionList::ExecuteAction
(003595AD) Vcl::Actnlist::TCustomAction::Execute
(00226F2C) System::Classes::_18201
(000326D1) USER32.dll
(000234E1) USER32.dll
(00021DA0) USER32.dll
(000218EB) 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 5.17.8

Error message:
Invalid access to memory.

Stack trace:
(00CC600C) UnixIncludeTrailingBackslash
(00F89E6E) C5296_0
(00F8BED6) ____ExceptionHandler
(00F88C90) __ExceptionHandler
(00088F2F) ntdll.dll
(000743C1) ntdll.dll.KiUserExceptionDispatcher
(00D184F6) TSessionData::IsInFolderOrWorkspace
(00D413BA) TStoredSessionList::IsFolderOrWorkspace
(00D4142A) TStoredSessionList::IsFolder
(0009C380) C16_0
(000A6857) UpdateJumpList
(000E04D2) TWinConfiguration::UpdateEntryInJumpList
(000E0663) TWinConfiguration::AddSessionToJumpList
(000E07E5) TWinConfiguration::UpdateJumpList
(000A662D) SetupInitialize
(00F87E81) __wstartup
(00067942) ntdll.dll.RtlGetAppContainerNamedObjectPath
(0006790F) ntdll.dll.RtlGetAppContainerNamedObjectPath

The problem happens rarely. I cannot reproduce it.