I can't reproduce the issue. Tested on 2 different systems: Windows and
Linux (both with wxWidgets 3.x).

Could you provide the project file and mention with mask you are deleting 
(image and mask number) when you get the assert message?
Maybe it is a coincidence of several different issues.
Is the option show extend of masks and crops switched on or off?

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https://bugs.launchpad.net/bugs/1451172

Title:
  hugin 2015.0.0-beta1 throws ASSERT INFO; invalid list ctrl item index
  in SetItem when deleteing a mask

Status in Hugin - Panorama Tools GUI:
  New

Bug description:
  In hugin 2015.0.0-Beta1, when deleting a mask, the following is thrown

  ASSERT INFO:
  ../src/generic/listctrl.cpp(3367): assert "litem >= 0 && (size_t)litem < 
GetItemCount()" failed in SetItemState(): invalid list ctrl item index in 
SetItem

  BACKTRACE:
  [1] wxGenericListCtrl::SetItemState(long, long, long)
  [2] MaskEditorPanel::panoramaImagesChanged(HuginBase::Panorama&, 
std::set<unsigned int, std::less<unsigned int>, std::allocator<unsigned int> > 
const&)
  [3] HuginBase::Panorama::changeFinished(bool)
  [4] PanoCommand::PanoCommand::execute()
  [5] PanoCommand::CommandHistory::addCommand(PanoCommand::PanoCommand*, bool)
  [6] MaskEditorPanel::OnMaskDelete(wxCommandEvent&)
  [7] wxAppConsoleBase::CallEventHandler(wxEvtHandler*, wxEventFunctor&, 
wxEvent&) const
  [8] wxEvtHandler::ProcessEventIfMatchesId(wxEventTableEntryBase const&, 
wxEvtHandler*, wxEvent&)
  [9] wxEventHashTable::HandleEvent(wxEvent&, wxEvtHandler*)
  [10] wxEvtHandler::TryHereOnly(wxEvent&)
  [11] wxEvtHandler::ProcessEventLocally(wxEvent&)
  [12] wxEvtHandler::ProcessEvent(wxEvent&)
  [13] wxWindowBase::TryAfter(wxEvent&)
  [14] wxWindowBase::TryAfter(wxEvent&)
  [15] wxWindowBase::TryAfter(wxEvent&)
  [16] wxWindowBase::TryAfter(wxEvent&)
  [17] wxEvtHandler::SafelyProcessEvent(wxEvent&)
  [18] g_signal_emit_valist
  [19] g_signal_emit
  [20] g_closure_invoke
  [21] g_signal_emit_valist
  [22] g_signal_emit
  [23] g_closure_invoke
  [24] g_signal_emit_valist
  [25] g_signal_emit
  [26] gtk_propagate_event
  [27] gtk_main_do_event
  [28] g_main_context_dispatch
  [29] g_main_loop_run
  [30] gtk_main
  [31] wxGUIEventLoop::DoRun()
  [32] wxEventLoopBase::Run()
  [33] wxAppConsoleBase::MainLoop()
  [34] wxEntry(int&, wchar_t**)
  [35] main
  [36] __libc_start_main
  [37] _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

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