ASSERT INFO:
../src/gtk/toplevel.cpp(988): assert "m_widget" failed in Show(): invalid frame

BACKTRACE:
[1] wxTopLevelWindowGTK::Show(bool)
[2] wxTopLevelWindowBase::Destroy()
[3] wxEvtHandler::ProcessEventIfMatchesId(wxEventTableEntryBase const&, wxEvtHandler*, wxEvent&)
[4] wxEventHashTable::HandleEvent(wxEvent&, wxEvtHandler*)
[5] wxEvtHandler::TryHereOnly(wxEvent&)
[6] wxEvtHandler::ProcessEventLocally(wxEvent&)
[7] wxEvtHandler::ProcessEvent(wxEvent&)
[8] wxEvtHandler::SafelyProcessEvent(wxEvent&)
[9] wxTimerImpl::SendEvent()
[10] g_main_context_dispatch
[11] g_main_loop_run
[12] gtk_main
[13] wxGUIEventLoop::DoRun()
[14] wxEventLoopBase::Run()
[15] wxAppConsoleBase::MainLoop()
[16] wxEntry(int&, wchar_t**)
[17] __libc_start_main