Assertion failed when trying to delete component from library

[henrik]

Pressing trashcan icon in eeschema library editor to delete footprint from library gives assertion error.

ASSERT INFO:
/usr/include/wx-3.0/wx/strvararg.h(456): assert "(argtype & (wxFormatStringSpecifier<T>::value)) == argtype" failed in wxArgNormalizer(): format specifier doesn't match argument type

BACKTRACE:
[1] int wxString::Printf<unsigned long, wchar_t const*>(wxFormatString const&, unsigned long, wchar_t const*)
[2] wxAppConsoleBase::CallEventHandler(wxEvtHandler*, wxEventFunctor&, wxEvent&) const
[3] wxEvtHandler::ProcessEventIfMatchesId(wxEventTableEntryBase const&, wxEvtHandler*, wxEvent&)
[4] wxEventHashTable::HandleEvent(wxEvent&, wxEvtHandler*)
[5] wxEvtHandler::TryHereOnly(wxEvent&)
[6] wxEvtHandler::DoTryChain(wxEvent&)
[7] wxEvtHandler::ProcessEvent(wxEvent&)
[8] wxWindowBase::TryAfter(wxEvent&)
[9] wxAuiToolBar::OnLeftUp(wxMouseEvent&)
[10] wxAppConsoleBase::CallEventHandler(wxEvtHandler*, wxEventFunctor&, wxEvent&) const
[11] wxEvtHandler::ProcessEventIfMatchesId(wxEventTableEntryBase const&, wxEvtHandler*, wxEvent&)
[12] wxEventHashTable::HandleEvent(wxEvent&, wxEvtHandler*)
[13] wxEvtHandler::TryHereOnly(wxEvent&)
[14] wxEvtHandler::ProcessEventLocally(wxEvent&)
[15] wxEvtHandler::ProcessEvent(wxEvent&)
[16] wxEvtHandler::SafelyProcessEvent(wxEvent&)
[17] g_closure_invoke
[18] g_signal_emit_valist
[19] g_signal_emit
[20] gtk_propagate_event
[21] gtk_main_do_event
[22] g_main_context_dispatch
[23] g_main_loop_run
[24] gtk_main
[25] wxGUIEventLoop::DoRun()
[26] wxEventLoopBase::Run()
[27] wxAppConsoleBase::MainLoop()
[28] APP_KICAD::OnRun() kicad.cpp:274
[29] wxEntry(int&, wchar_t**)
[30] main kicad.cpp:306
[31] __libc_start_main
[32] _start

Application: kicad
Version: (2015-04-14 BZR 5599)-product Debug build
wxWidgets: Version 3.0.1 (debug,wchar_t,compiler with C++ ABI 1002,GCC 4.9.1,wx containers,compatible with 2.8)
Platform: Linux 3.16.0-34-generic x86_64, 64 bit, Little endian, wxGTK
Boost version: 1.54.0
         USE_WX_GRAPHICS_CONTEXT=OFF
         USE_WX_OVERLAY=OFF
         KICAD_SCRIPTING=ON
         KICAD_SCRIPTING_MODULES=ON
         KICAD_SCRIPTING_WXPYTHON=ON
         USE_FP_LIB_TABLE=HARD_CODED_ON
         BUILD_GITHUB_PLUGIN=ON