Migrated from: https://dev.bukkit.org/projects/shopkeepers/issues/389

Originally posted by mat41997 (Apr 15, 2016):

What steps will reproduce the problem?
1.TacoSpigot 1.9.2 #47
2.Java 9 #113
3.Plugins.. preciusstones and others..What version of the product are you using?
v1.71Do you have an error log of what happened?
http://hastebin.com/izozebelud.avrasmPlease provide any additional information below.
i don't have any idea

Originally commented by blablubbabc (Apr 15, 2016):

I don't have this problem with the general version of spigot (which by the way is the only version I officially support Shopkeepers for). So currently I assume this might be an issue with 'TacoSpigot' or 'PaperSpigot'.
There were some Potion related changes in Spigot a few days ago, maybe those spigot derivatives weren't updated to cope with that yet.

Originally closed by blablubbabc (Apr 15, 2016)