A player is trying to buy an item from a custom vending machine and then they get kicked and cant rejoin the server with this error

Bagadonuts disconnecting: Exception (cs:132862): NullReferenceException: Object reference not set to an instance of an object. VendingMachineScreen.Update () (at <00000000000000000000000000000000>:0)

I removed the plugin and vending machine and it stopped happening

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This is a hardcore server by the way, if that makes a difference.  

also have the same errors but not sure where to come from, because in my case, the custom vending plugin is still running but when i remove the monument addon that spawns my extra vending,s players get that error when they get close to that vending

It definitely is this plugin, I put it back on, players get kicked even when buying a horse saddle at large barn.  If i remove this plugin, it stops happening  

I haven't been able to reproduce this issue yet and I don't currently have any ideas on what could cause it. The error happens on the client side code so it's difficult to infer what server side changes lead to it.

The places I have heard so far causing it are large barn horse seller, research table at bandit, and a vending machine I placed at large barn

I'll try to gather more places people complain it happens.

I've got 50-70 concurrent pop on the server and its only happening to about 5 people during 4-6 hour timeframe.

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Figured it out... I had a research paper for sale and they took that skin and moved it to the advanced blueprint fragments, and left the research paper as a white square with no skin.