Comment 2 for bug 742280

StacktraceTop:
 ?? () from /usr/lib/compiz/libunityshell.so
 g_cclosure_marshal_VOID__VOID (closure=0x8a87d20, return_value=0x0, n_param_values=1, param_values=0xb57cf430, invocation_hint=0xbf881780, marshal_data=0x0) at /build/buildd/glib2.0-2.28.4/./gobject/gmarshal.c:79
 g_closure_invoke (closure=0x8a87d20, return_value=0x0, n_param_values=1, param_values=0xb57cf430, invocation_hint=0xbf881780) at /build/buildd/glib2.0-2.28.4/./gobject/gclosure.c:767
 signal_emit_unlocked_R (node=0x8a98dd0, detail=0, instance=0x8705050, emission_return=0x0, instance_and_params=0xb57cf430) at /build/buildd/glib2.0-2.28.4/./gobject/gsignal.c:3252
 g_signal_emit_valist (instance=0x8705050, signal_id=182, detail=0, var_args=0xbf88193c "0\241\071\a\210\204:\265\210\204:\265h\031\210\277\313P\211\263\300+=\256\360\021=\256p\261q\263`Pp\b\030") at /build/buildd/glib2.0-2.28.4/./gobject/gsignal.c:2983