[17:43:38 ERROR]: Could not pass event PlayerInteractEntityEvent to plugin vBETA 0.1
org.bukkit.event.EventException: null
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[server.jar:git-Spigot-d21162c-61e0c69]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[server.jar:git-Spigot-d21162c-61e0c69]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) [server.jar:git-Spigot-d21162c-61e0c69]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) [server.jar:git-Spigot-d21162c-61e0c69]
at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1580) [server.jar:git-Spigot-d21162c-61e0c69]
at net.minecraft.server.v1_12_R1.PacketPlayInUseEntity.a(SourceFile:69) [server.jar:git-Spigot-d21162c-61e0c69]
at net.minecraft.server.v1_12_R1.PacketPlayInUseEntity.a(SourceFile:13) [server.jar:git-Spigot-d21162c-61e0c69]
at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [server.jar:git-Spigot-d21162c-61e0c69]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_131]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_131]
at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [server.jar:git-Spigot-d21162c-61e0c69]
at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:748) [server.jar:git-Spigot-d21162c-61e0c69]
at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [server.jar:git-Spigot-d21162c-61e0c69]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [server.jar:git-Spigot-d21162c-61e0c69]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [server.jar:git-Spigot-d21162c-61e0c69]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]
Caused by: java.lang.IllegalArgumentException: passenger == null
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:122) ~[server.jar:git-Spigot-d21162c-61e0c69]
at org.bukkit.craftbukkit.v1_12_R1.entity.CraftEntity.addPassenger(CraftEntity.java:386) ~[server.jar:git-Spigot-d21162c-61e0c69]
at project.minigame.sheepwars.JoinToGame.onPlayerInteractEntity(JoinToGame.java:232) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_131]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_131]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_131]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_131]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[server.jar:git-Spigot-d21162c-61e0c69]
... 15 more