encountered exception java.lang.IllegalArgumentException

[Plooper12]

BungeeCord-Bootstrap:1.13-SNAPSHOT:367a127:222

BungeeHub 1.1 by Inkzzz
BungeeMSG v2.2.0 by O_o_Fadi_o_O
BungeePluginManager 1.0 by Shevchik
BungeeStaffChat-1.5.2 by Wout_
BungeeTools-HubCommand-v0.2 by De24
CustomPayloadFixer 1.5 by justblender
Maintenance 2.4 by KennyTV
movemenow-1.2-17 by roblabla
ServerListPlus-3.4.6-Universal by Minecrell
SkinsRestorer-13.5.1 by Th3Tr0LLeR, DoNotSpamPls, Blackfire62
ViaVersion-1.6.0 by _MylesC, Matsv

https://pastebin.com/0356HEtT

Hi, I've done some stress tests on my server
Adding 300 bots the Lobbies do not suffer lag but in the bungee cord sometimes these errors usually to show