Migrated from: https://dev.bukkit.org/projects/shopkeepers/issues/306

Originally posted by FatherWh0 (Mar 25, 2015):

What steps will reproduce the problem?
1.Create a trade shopkeeper.
2.Set up trade with enchanted weapon.
3.Attempt to make the trade.What is the expected output? What do you see instead?
Expected chest contents to represent the trade completed.
Contents of chest do not change and Error occurs on the console.What version of the product are you using?
Occurs with 1.50 and 1.52Do you have an error log of what happened?
Yes, attachedPlease provide any additional information below.
One of the player shopkeepers on my server has been trading diamond blocks for heavily (not unsafe) enchanted weapons. Recently the trades stopped working. When someone makes a trade it seems to work but the contents of the chest do not change, thus the item traded for is dupped and items traded are lost. This also causes the following error on the console:
[Server thread/ERROR]: Could not pass event InventoryClickEvent to Shopkeepers v1.52

Originally commented by blablubbabc (Mar 25, 2015):

You have to update your spigot to the latest build.

        Edited Mar 25, 2015

Originally closed by blablubbabc (Mar 25, 2015)