Connection Lost Error

[MaxerG Server]

Hi,
I have a Bungeecord network. It runs fine without any bugs but when I try to connect a survival server (1.15.2) to it, it has a bug when I join.

So. I have 5 servers. Proxy, Hub, Gamemode 1, GameMode2 and Survival.
Proxy runs on BungeeCord 1489 (latest)
All other servers run on Paper 1.12.2 build 1618 (latest) except Survival. Survival runs on Paper 1.15.2 build 185 (latest - released today).
But whenever i try to join my Survival Server (with MC version 1.15.2) i get this error: https://gyazo.com/4182f143cbcb33d70920a8febda13325

Plugins BungeeCord:

Spoiler: Plugins

- AntiBungeePluginSteal 1.0.3
- BungeeTabListPlus 2.8.12
- FakeOnlinePlayers (to troll my staff sometimes with a fake "ddos" attack)
- IPWhitelist 2.6
- Litebans 2.3.18
- Luckperms 5.0.100
- NetworkManager 2.8.6
- ServerListPlus
- Slashserver
- ViaBackwards 2.4.0-SNAPSHOT
- ViaVersion 2.2.3

Plugins Hub:

Spoiler: Plugins

- AAC 4.3.8
- AACAdditionPro 6.1.0
- AnimationLib
- Automessage 2.6.0
- AWD
- BanAnimations
- Bannerboard 1.10.2
- BlockParticals 1.11.1
- BuyCraftX
- ChatColorPremium
- Citizens
- CommandNPC 1.9.1
- ConditialCommands 1.4-SNAPSHOT
- CoreProtect 2.14.4
- DeluxeMenus 1.13.0
- DisableJoinMessage
- EssentialsX 2.17.1.0
- EssentialsX Spawn 2.17.1.0
- FeatherBoard
- HeadDatabase
- HideAndCustomPlugins
- HideItem
- HolographicDisplays
- icJukeBox
- IPWhitelistBukkit 2.1
- ItemJoin
- LeakParkour
- Litebans 2.3.18
- Luckperms 5.0.100
- MVDWPlaceholderAPI
- NetworkManager 2.8.6
- NoRain 1.4
- NoWeather
- PlaceHolderAPI 2.10.5
- Plugman
- ProtocolLib
- SkinsRestorer
- TitleManager 2.1.6
- UltimateBossBar
- UltraCosmetics 2.5.7
- Vault 1.6.7
- WorldBorder
- WorldEdit 6.1.9
- WorldGuard 6.2.1

Plugins Survival:

Spoiler: Plugins

- IPWhiteListBukkit 2.1

 

[Em]

Is there any error in console on the survival server when you get kicked?

 

[MaxerG Server]

nope, nothing on Bungee, Hub and Survival