/shop command errors due to invalid shop on NPCFixed

Actually, that is failing to get a shop from the NPC itself that you are standing in front of.
Looks like you have set up an invalid shop, please forward me your config on discord so that I may take a look at it. 
Discord id @Khan#8615

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Technically it should be sending a message response not erroring in console I would like to use your config for debugging purposes

As of version 2.3.16 & up this issue has been fixed. ( For others still asking around ) 

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