<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 5.9.1

Error message:
Ошибка доступа к памяти.

Трассировка стека:
(003B4339) System::Actions::TContainedActionList::TContainedActionList
(0008148F) ntdll.dll
(0006F02A) ntdll.dll.KiUserExceptionDispatcher
(00362D91) System::Classes::_17670
(00362FBC) System::Classes::TReader::ReadComponent
(0036326D) System::Classes::TReader::ReadDataInner
(003631AC) System::Classes::TReader::ReadData
(00370D9D) System::Classes::TComponent::ReadState
(0035E052) System::Classes::TStream::ReadComponent
(00353A97) System::Classes::_17089
(003553EB) System::Classes::_17116
(00355479) System::Classes::InitInheritedComponent
(003723A4) System::Classes::TDataModule::TDataModule
(0003156E) TNonVisualDataModule::TNonVisualDataModule
(000D5D24) Execute
(000024A8) wWinMain
(0086076D) __wstartup
(0005F717) ntdll.dll
(0005F6DF) ntdll.dll

(003B4339) System::Actions::TContainedActionList::TContainedActionList
(0008148F) ntdll.dll
(0006F02A) ntdll.dll.KiUserExceptionDispatcher
(00362D91) System::Classes::_17670
(00362FBC) System::Classes::TReader::ReadComponent
(0036326D) System::Classes::TReader::ReadDataInner
(003631AC) System::Classes::TReader::ReadData
(00370D9D) System::Classes::TComponent::ReadState
(0035E052) System::Classes::TStream::ReadComponent
(00353A97) System::Classes::_17089
(003553E

The problem happens rarely. I cannot reproduce it.