Comment 2 for bug 741674

StacktraceTop:
 ?? ()
 closure_invoke_notifiers (closure=0x1000000, return_value=0x0, n_param_values=4, param_values=0x176c1e0, invocation_hint=0x7fffa0732610) at /build/buildd/glib2.0-2.28.4/./gobject/gclosure.c:289
 g_closure_invoke (closure=0x1000000, return_value=0x0, n_param_values=4, param_values=0x176c1e0, invocation_hint=0x7fffa0732610) at /build/buildd/glib2.0-2.28.4/./gobject/gclosure.c:773
 signal_emit_unlocked_R (node=<value optimized out>, detail=0, instance=0xec4610, emission_return=0x0, instance_and_params=0x176c1e0) at /build/buildd/glib2.0-2.28.4/./gobject/gsignal.c:3252
 g_signal_emit_valist (instance=<value optimized out>, signal_id=<value optimized out>, detail=<value optimized out>, var_args=<value optimized out>) at /build/buildd/glib2.0-2.28.4/./gobject/gsignal.c:2983