Unzulässiger Zugriff auf einen Speicherbereich - System::FreeMem

<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 6.7

Error message:
Unzulässiger Zugriff auf einen Speicherbereich.

Stapelverfolgung:
(003CCFC9) Vcl::Controls::_17057
(000B51E0) ntdll.dll
(000B51AF) ntdll.dll
(0006CC4E) ntdll.dll
(0007962A) ntdll.dll
(00169700) System::FreeMem
(001705DF) System::DynArrayClear
(0021C5D8) System::Classes::TList::Clear
(003CCF92) Vcl::Controls::_17057
(0016AC6C) System::TObject::FreeInstance
(003CD2D9) Vcl::Controls::TWinControl::AlignControls
(003CD3AA) Vcl::Controls::TWinControl::AlignControl
(003C796D) Vcl::Controls::TControl::RequestAlign
(003D0747) Vcl::Controls::TWinControl::RequestAlign
(003D1D5A) Vcl::Controls::TWinControl::SetBounds
(000237BF) USER32.dll
(000237F2) USER32.dll
(000237CD) USER32.dll
(0016B056) System::IsClass
(00569B46) Tb2dock::TTBCustomDockableWindow::SetBounds
(0003E887) TCustomScpExplorerForm::PlaceReconnectControls
(003CD1AD) Vcl::Controls::TWinControl::AlignControls
(000488E1) TCustomScpExplorerForm::RemoteDirViewResize
(0016B13A) System::CallDynaInst
(003C7991) Vcl::Controls::TControl::Resize
(003D04DE) Vcl::Controls::TWinControl::WMSize
(003CA36A) Vcl::Controls::TControl::WndProc
(003D0155) Vcl::Controls::TWinControl::WMNotify
(003CA36A) Vcl::Controls::TControl::WndProc
(000369FC) UXTHEME.DLL
(0003626E) UXTHEME.DLL
(000361FB) UXTHEME.DLL
(00092B59) ntdll.dll
(003CF515) Vcl::Controls::TWinControl::WndProc
(00029BF9) UXTHEME.DLL
(00447027) Vcl::Comctrls::TCustomListView::WndProc
(003CEA20) Vcl::Controls::TWinControl::MainWndProc
(00235394) System::Classes::_18364
(00038CC1) USER32.dll
(00027D78) USER32.dll
(00027A63) USER32.dll
(00027E79) USER32.dll
(000274E5) USER32.dll
(00082AD4) COMCTL32.DLL
(000329D7) USER32.dll
(0000025A) win32u.dll
(000262FF) USER32.dll
(00082B73) COMCTL32.DLL
(0002FA70) UXTHEME.DLL
(0000025A) win32u.dll
(000262FF) USER32.dll
(000828EC) COMCTL32.DLL
(00038CC1) USER32.dll
(00027D78) USER32.dll
(00027A63) USER32.dll
(0005DDC4) COMCTL32.DLL
(0005DEFB) COMCTL32.DLL
(00050175) ntdll.dll
(000274E5) USER32.dll
(00050714) ntdll.dll
(000274E5) USER32.dll
(0055AA63) Dragdrop::TDragDrop::WndMethod
(00094F99) ntdll.dll
(00050714) ntdll.dll
(00235394) System::Classes::_18364
(00038CC1) USER32.dll
(00027D78) USER32.dll
(00027A63) USER32.dll
(0002781B) USER32.dll
(000329D7) USER32.dll
(00079604) ntdll.dll
(000001EA) win32u.dll
(000290ED) USER32.dll
(0002AAD5) USER32.dll
(0002A638) USER32.dll
(000271E4) UXTHEME.DLL
(00026383) UXTHEME.DLL
(0002A767) USER32.dll
(000955CD) COMCTL32.DLL
(000955DF) COMCTL32.DLL
(00094F74) COMCTL32.DLL
(00029BF9) UXTHEME.DLL
(00029C09) UXTHEME.DLL
(0003C0F5) ntdll.dll
(0003FFF0) USER32.dll
(000282C2) USER32.dll
(0003FFF0) USER32.dll
(000282C2) USER32.dll
(00027F12) USER32.dll
(00094672) COMCTL32.DLL
(00038CC1) USER32.dll
(00027D78) USER32.dll
%

The problem happens rarely. I cannot reproduce it.