I updated the plugin a couple days ago and now I'm seeing this in my console:
03/08 18:23:03 | Failed to call hook 'OnItemCraft' on plugin 'InstantCraft v2.2.0' (NullReferenceException: Object reference not set to an instance of an object)
at Item.OnChanged () [0x0001d] in <2e0a38bcd133484ab2c4addf530cb92f>:0
at Item.MarkDirty () [0x00000] in <2e0a38bcd133484ab2c4addf530cb92f>:0
at Item.set_maxCondition (System.Single value) [0x00029] in <2e0a38bcd133484ab2c4addf530cb92f>:0
at Item.Initialize (ItemDefinition template) [0x00010] in <2e0a38bcd133484ab2c4addf530cb92f>:0
at ItemManager.Create (ItemDefinition template, System.Int32 iAmount, System.UInt64 skin) [0x00065] in <2e0a38bcd133484ab2c4addf530cb92f>:0
at Oxide.Plugins.InstantCraft.Give (ItemCraftTask task, System.Int32 amount, System.UInt64 skin) [0x0000b] in <9bd71652e65f452cb07cc80f47973aa8>:0
at Oxide.Plugins.InstantCraft.GiveItem (ItemCraftTask task, System.Collections.Generic.List`1[T] stacks) [0x00040] in <9bd71652e65f452cb07cc80f47973aa8>:0
at Oxide.Plugins.InstantCraft.OnItemCraft (ItemCraftTask task) [0x000f1] in <9bd71652e65f452cb07cc80f47973aa8>:0
at Oxide.Plugins.InstantCraft.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0005b] in <9bd71652e65f452cb07cc80f47973aa8>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <60c318df79ed41688ea59335e48d61ad>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <50629aa0e75d4126b345d8d9d64da28d>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <50629aa0e75d4126b345d8d9d64da28d>:0