Comment 2 for bug 1502616

StacktraceTop:
 ?? ()
 _gtk_marshal_BOOLEAN__BOXED (closure=0xde36d0, return_value=0x7ffcde85e440, n_param_values=<optimized out>, param_values=0x7ffcde85e4f0, invocation_hint=<optimized out>, marshal_data=<optimized out>) at gtkmarshalers.c:85
 g_closure_invoke (closure=0xde36d0, return_value=0x7ffcde85e440, n_param_values=2, param_values=0x7ffcde85e4f0, invocation_hint=0x7ffcde85e490) at /build/buildd/glib2.0-2.40.2/./gobject/gclosure.c:768
 signal_emit_unlocked_R (node=node@entry=0x8d1aa0, detail=detail@entry=0, instance=instance@entry=0xa8e4b0, emission_return=emission_return@entry=0x7ffcde85e5c0, instance_and_params=instance_and_params@entry=0x7ffcde85e4f0) at /build/buildd/glib2.0-2.40.2/./gobject/gsignal.c:3551
 g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=var_args@entry=0x7ffcde85e688) at /build/buildd/glib2.0-2.40.2/./gobject/gsignal.c:3317