Invalid access to memory - TCustomUnixDriveView::Dispatch

I got this error when I fired up the program from my desktop icon.

WinSCP 5.15.2

Error message:
Invalid access to memory.

Stack trace:
(00000603) DWMAPI.DLL.DwmIsCompositionEnabled
(0006248E) ntdll.dll
(0000F15E) ntdll.dll.KiUserExceptionDispatcher
(006D43E6) TCustomUnixDriveView::Dispatch
(00278F45) Vcl::Controls::TWinControl::WndProc
(002AF296) Vcl::Comctrls::TCustomTreeView::WndProc
(003A3BA8) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(0001FD3A) USER32.dll
(0001FD60) USER32.dll.CallWindowProcW
(0047A973) Dragdrop::TDragDrop::WndMethod
(003A3BA8) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(00015DE3) USER32.dll
(00015E41) USER32.dll
(0000F137) ntdll.dll.KiUserCallbackDispatcher
(00016885) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.