Worked well for months. Now when trying to craft this error 

16:38:01) | Failed to call hook 'OnItemCraft' on plugin 'InstantCraft v2.1.0' (NullReferenceException: Object reference not set to an instance of an object)

at Oxide.Plugins.InstantCraft.IsBlocked (System.String name) [0x00000] in <5e0e966b46a241c1bbce95ea86a4f45e>:0

at Oxide.Plugins.InstantCraft.OnCraft (ItemCraftTask task) [0x00037] in <5e0e966b46a241c1bbce95ea86a4f45e>:0

at Oxide.Plugins.InstantCraft.OnItemCraft (ItemCraftTask item) [0x00000] in <5e0e966b46a241c1bbce95ea86a4f45e>:0

at Oxide.Plugins.InstantCraft.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00126] in <5e0e966b46a241c1bbce95ea86a4f45e>:0

at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <9affce1cd15c4ec183941adef8db1722>:0

at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <4452f821def6406d834e4149849fe7ea>:0

at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <4452f821def6406d834e4149849fe7ea>:0

See https://umod.org/community/instant-craft/3204-nullreferenceexception-at-isblocked?page=1#post-3