Comment 2 for bug 1079252

StacktraceTop:
 g_variant_is_trusted (value=0x0) at /build/buildd/glib2.0-2.32.3/./glib/gvariant-core.c:604
 g_variant_builder_add_value (builder=0xbff3e0f0, value=0x0) at /build/buildd/glib2.0-2.32.3/./glib/gvariant.c:3393
 _dbus_feedler_service_updated (_sender=0x8eee240, channel=0x8f8ce08, _data=0x8ef7bb8) at /build/buildd/feedler-0.1+r309/src/service/service.vala:9
 g_cclosure_marshal_VOID__BOXEDv (closure=0x8ef8720, return_value=0x0, instance=0x8eee240, args=0xbff3e488 "\224\344\363\277 \355\360\bXa \265(\201\361\b\360\"\002\t\230\030\361\b", marshal_data=0x0, n_params=1, param_types=0x8eea5b0) at /build/buildd/glib2.0-2.32.3/./gobject/gmarshal.c:1160
 _g_closure_invoke_va (closure=0x8ef8720, return_value=0x0, instance=0x8eee240, args=0xbff3e488 "\224\344\363\277 \355\360\bXa \265(\201\361\b\360\"\002\t\230\030\361\b", n_params=1, param_types=0x8eea5b0) at /build/buildd/glib2.0-2.32.3/./gobject/gclosure.c:840