assert when deleting IMAP folder

ASSERT INFO:
.src/gui/wxMainFrame.cpp(140): assert "folder" failed in OnOpenHere(): can't open a NULL folder

BACKTRACE:
[1] wxOnAssert(char const*, int, char const*, char const*, char const*)
[2] wxMainFolderTree::OnOpenHere(MFolder*) .src/gui/wxMainFrame.cpp:140
[3] wxFolderTree::OnSelectionChange(MFolder*, MFolder*) .src/gui/wxFolderTree.cpp:938
[4] wxMainFolderTree::OnSelectionChange(MFolder*, MFolder*) .src/gui/wxMainFrame.cpp:136
[5] wxFolderTreeImpl::OnContextMenu(wxContextMenuEvent&) .src/gui/wxFolderTree.cpp:2891
[6] wxAppConsole::HandleEvent(wxEvtHandler*, void (wxEvtHandler::*)(wxEvent&), wxEvent&) cons)
[7] wxEvtHandler::ProcessEventIfMatches(wxEventTableEntryBase const&, wxEvtHandler*, wxEvent&)
[8] wxEventHashTable::HandleEvent(wxEvent&, wxEvtHandler*)
[9] wxEvtHandler::ProcessEvent(wxEvent&)
[10] wxEvtHandler::ProcessEvent(wxEvent&)
[11] wxScrollHelperEvtHandler::ProcessEvent(wxEvent&)
[12] wxWindow::GTKProcessEvent(wxEvent&) cons)
[13] g_closure_invoke()
[14] g_signal_emit_valist()
[15] g_signal_emit()
[16] gtk_propagate_event()
[17] gtk_main_do_event()
[18] g_main_context_dispatch()
[19] g_main_loop_run()
[20] gtk_main()
[21] wxEventLoop::Run()
[22] wxAppBase::MainLoop()
[23] wxAppBase::OnRun()

Regards,
Nerijus

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