Comment 2 for bug 1743442

StacktraceTop:
 _gdk_window_has_impl (window=window@entry=0x0) at /build/gtk+3.0-2Ut_nl/gtk+3.0-3.18.9/./gdk/gdkwindow.c:626
 gdk_x11_window_get_xid (window=window@entry=0x0) at /build/gtk+3.0-2Ut_nl/gtk+3.0-3.18.9/./gdk/x11/gdkwindow-x11.c:5527
 shell_gtk_embed_window_created_cb (display=0x1f0ff20, window=0x4eb4bd0, embed=0x3aa53f0) at shell-gtk-embed.c:67
 g_closure_invoke (closure=0x344b290, return_value=return_value@entry=0x0, n_param_values=2, param_values=param_values@entry=0x7ffeefc39030, invocation_hint=invocation_hint@entry=0x7ffeefc38fb0) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./gobject/gclosure.c:804
 signal_emit_unlocked_R (node=node@entry=0x1e54af0, detail=detail@entry=0, instance=instance@entry=0x1f0ff20, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7ffeefc39030) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./gobject/gsignal.c:3629