Hello,

In latest versions of the plugin, on Minecraft 1.13, if you drink a potion while having something held off hand, that thing will disappear and be replaced by an empty bottle (you need to be in survival to reproduce this bug).

Thank you for looking into this as soon as possible, since because of this issue we are forced to use older versions of OCM.

Commit 69f2a99 should fix this issue, please check

It works fine, thank you.