Bug Report

Type /ver NametagEdit and post the output.
4.5.14

What version of Bukkit/Spigot/PaperSpigot are you using? Type /ver
This server is running CraftBukkit version git-Spigot-21fe707-741a1bd (MC: 1.8.8) (Implementing API version 1.8.8-R0.1-SNAPSHOT)

What plugins are you using? Type /plugins
LuckPerms, FastAsyncWorldEdit, PlaceholderAPI, ProtocolLib, ServerNPC, Spark, NameTagEdit, DeluxeHub, LPC

Please explain your issue. How do you trigger it?
Apparently is an issue on your side. MySQL Client is not up to date.

Are there any errors in the console? Please use: https://pastebin.com
https://pastebin.com/0z2zxSNf