Bug Report

Type /ver NametagEdit and post the output.
NametagEdit version 4.2.0

What version of Bukkit/Spigot/PaperSpigot are you using? Type /ver
Spigot MC: 1.12.1

What plugins are you using? Type /plugins

Please explain your issue. How do you trigger it?
I set a nickname with BetterNicks (1), it's appear in the tablist, but when I disconnect and reconnect, my nickname disappear, if think it's NTE because it remove my nickname when I disconnect myself (2)

Are there any errors in the console? Please use: https://pastebin.com
Nope but I got the log file : https://pastebin.com/HXyrSBNS