Initialization Log 2

11.02 17:10:12 [Server] Netty Epoll Server IO #7/ERROR [Sponge]: Could not pass ClientConnectionEvent$Auth$Impl to Plugin{id=changeskin, name=ChangeSkin, version=3.0, description=Change your Minecraft skin in-game, url=https://dev.bukkit.org/bukkit-plugins/changeskin/, source=/mods/changeskin-universal-3.0.jar}
11.02 17:10:12 [Server] INFO java.lang.NullPointerException: null
11.02 17:10:12 [Server] INFO at com.github.games647.changeskin.sponge.LoginListener.onPlayerPreLogin(LoginListener.java:39) ~[LoginListener.class:?]
11.02 17:10:12 [Server] INFO at org.spongepowered.common.event.listener.AuthListener_LoginListener_onPlayerPreLogin64.handle(Unknown Source) ~[?:?]
11.02 17:10:12 [Server] INFO at org.spongepowered.common.event.RegisteredListener.handle(RegisteredListener.java:95) ~[RegisteredListener.class:1.12.2-2586-7.1.0-BETA-2893]
11.02 17:10:12 [Server] INFO at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:342) [SpongeModEventManager.class:1.12.2-2586-7.1.0-BETA-2893]
11.02 17:10:12 [Server] INFO at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:371) [SpongeModEventManager.class:1.12.2-2586-7.1.0-BETA-2893]
11.02 17:10:12 [Server] INFO at org.spongepowered.common.event.SpongeEventManager.post(SpongeEventManager.java:422) [SpongeEventManager.class:1.12.2-2586-7.1.0-BETA-2893]
11.02 17:10:12 [Server] INFO at org.spongepowered.common.SpongeImpl.postEvent(SpongeImpl.java:207) [SpongeImpl.class:1.12.2-2586-7.1.0-BETA-2893]