if ((gdk_event->keyval == GDK_Tab) || (gdk_event->keyval == GDK_ISO_Left_Tab))
{
int sel = win->GetSelection();
+ if (sel == -1)
+ return TRUE;
wxGtkNotebookPage *nb_page = win->GetNotebookPage(sel);
wxCHECK_MSG( nb_page, FALSE, _T("invalid selection in wxNotebook") );