Comment 2 for bug 797373

StacktraceTop:
 g_type_check_instance_cast (type_instance=0x7fabf5b1dce0, iface_type=42107264) at /build/buildd/glib2.0-2.28.6/./gobject/gtype.c:3994
 event_text_channel_process_func (event=0x3559ca0) at empathy-event-manager.c:352
 g_closure_invoke (closure=0x7fabdc0b5860, return_value=0x0, n_param_values=2, param_values=0x3554100, invocation_hint=0x7fffe49ffe00) at /build/buildd/glib2.0-2.28.6/./gobject/gclosure.c:767
 signal_emit_unlocked_R (node=<value optimized out>, detail=0, instance=0x269e9c0, emission_return=0x0, instance_and_params=0x3554100) at /build/buildd/glib2.0-2.28.6/./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/glib2.0-2.28.6/./gobject/gsignal.c:2983