<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 5.15.9

Error message:
Invalid access to memory.

Stack trace:
(0081A5B7) TTerminal::DoEndTransaction
(00087D6F) ntdll.dll
(00073211) ntdll.dll.KiUserExceptionDispatcher
(0081A596) TTerminal::EndTransaction
(0081A596) TTerminal::EndTransaction
(0084A9D2) DoConsoleDialog
(0001F30D) TCustomScpExplorerForm::OpenConsole
(00050CF9) TScpCommanderForm::OpenConsole
(000465A4) TNonVisualDataModule::ExplorerActionsExecute
(003E78A0) System::Actions::TContainedActionList::ExecuteAction
(001C6489) Vcl::Actnlist::TCustomAction::Execute
(003A3E7C) System::Classes::_18201
(000436C9) USER32.dll
(000250B7) USER32.dll
(00024209) USER32.dll
(00023FCB) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.