https://gist.github.com/xIPad3Zockerx/299526896d16f413bedbd303a4293080

EssentialsX version (/essentials): 2.0.1-b488

Server software (/version): git-Spigot-edd0396-20ab5d3 (MC: 1.12.1) (Implementing API version 1.12.1-R0.1-SNAPSHOT)

This issue is fixed in newer builds - as noted above, please update EssentialsX.