Comment 2 for bug 903019

StacktraceTop:
 notify_gtk_theme_name_cb (gobject=<optimized out>, pspec=<optimized out>, user_data=<optimized out>) at /build/buildd/overlay-scrollbar-0.2.13/./os/os-bar.c:216
 g_closure_invoke (closure=0x21ddee0, return_value=0x0, n_param_values=2, param_values=0x1fc7810, invocation_hint=<optimized out>) at /build/buildd/glib2.0-2.31.2/./gobject/gclosure.c:774
 signal_emit_unlocked_R (node=<optimized out>, detail=688, instance=<optimized out>, emission_return=0x0, instance_and_params=0x1fc7810) at /build/buildd/glib2.0-2.31.2/./gobject/gsignal.c:3302
 g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=0x7fff0bdf6cc8) at /build/buildd/glib2.0-2.31.2/./gobject/gsignal.c:3033
 g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>) at /build/buildd/glib2.0-2.31.2/./gobject/gsignal.c:3090