diff --git a/dbus/dbus-gobject.c b/dbus/dbus-gobject.c
index 41ac47e..3737d08 100644
--- a/dbus/dbus-gobject.c
+++ b/dbus/dbus-gobject.c
@@ -1348,7 +1348,8 @@ gerror_domaincode_to_dbus_error_name (const DBusGObjectInfo *object_info,
 	  g_type_class_unref (klass);
 
 	  domain_str = info->default_iface;
-	  code_str = value->value_nick;
+	  if (value)
+	    code_str = value->value_nick;
 	}
     }