Since the update we are getting this in the console a lot:

Exception while calling NextTick callback (NullReferenceException: Object reference not set to an instance of an object)
at Item.OnChanged () [0x00000] in <d80724673c3e443aa87ae614e5548969>:0
at Item.MarkDirty () [0x00000] in <d80724673c3e443aa87ae614e5548969>:0
at Oxide.Plugins.GeneralItemModifier+ItemModStatsChanger+<>c__DisplayClass2_0.<OnItemCreated>b__0 () [0x00050] in <f890f01a70444a049b85862256591e77>:0
at Oxide.Core.OxideMod.OnFrame (System.Single delta) [0x00051] in <beb2b64691c64e2b95b99491bd85442c>:0​

    public void OnChanged()
    {
        ItemMod[] itemModArray = this.info.itemMods;
        for (int i = 0; i < (int)itemModArray.Length; i++)
        {
            itemModArray[i].OnChanged(this);
        }
        if (this.contents != null)
        {
            this.contents.OnChanged();
        }
    }​

Don't worry, problem solved, it was an error in the servers Kits config. A custom item display name was null, which caused the error in this plugin.