hugin 2015.0.0-beta1 throws ASSERT INFO; format specifier doesn't match argument type when opening the control points list

When opening the control points list, hugin 2015.0.0-beta1 throws

ASSERT INFO:
/usr/include/wx-3.0/wx/strvararg.h(451): assert "(argtype & (wxFormatStringSpecifier<T>::value)) == argtype" failed in wxArgNormalizer(): format specifier doesn't match argument type

BACKTRACE:
[1] wxString wxString::Format<unsigned long>(wxFormatString const&, unsigned long)
[2] CPListCtrl::OnGetItemText(long, long) const
[3] wxAppConsoleBase::CallEventHandler(wxEvtHandler*, wxEventFunctor&, wxEvent&) const
[4] wxEvtHandler::ProcessEventIfMatchesId(wxEventTableEntryBase const&, wxEvtHandler*, wxEvent&)
[5] wxEventHashTable::HandleEvent(wxEvent&, wxEvtHandler*)
[6] wxEvtHandler::TryHereOnly(wxEvent&)
[7] wxEvtHandler::ProcessEventLocally(wxEvent&)
[8] wxEvtHandler::ProcessEvent(wxEvent&)
[9] wxEvtHandler::SafelyProcessEvent(wxEvent&)
[10] wxWindow::GTKSendPaintEvents(_GdkRegion const*)
[11] g_closure_invoke
[12] g_signal_emit_valist
[13] g_signal_emit
[14] gtk_main_do_event
[15] gdk_window_process_all_updates
[16] g_main_context_dispatch
[17] g_main_loop_run
[18] gtk_main
[19] wxGUIEventLoop::DoRun()
[20] wxEventLoopBase::Run()
[21] wxAppConsoleBase::MainLoop()
[22] wxEntry(int&, wchar_t**)
[23] main
[24] __libc_start_main
[25] _start

This is under Ubuntu 14.04 LTS using 2015.0.0~beta1+dfsg-0ubuntu2~trusty from
https://launchpad.net/~hugin/+archive/ubuntu/next.

Please note that this version already has
6903:aace4a6969bc : Fixes a further assert message
and
6904:213b546a477e: Fixes crash in cp editor [1449065]
applied

With kind regards

Stefan Peter