This is in my console when somebody goes into an Entry Bouncer field:

14:26:04 [SEVERE] Could not pass event PlayerTeleportEvent to PreciousStones v9.5.2
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:341)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
at org.bukkit.craftbukkit.entity.CraftPlayer.teleport(CraftPlayer.java:364)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:230)
at net.minecraft.server.Packet10Flying.handle(SourceFile:136)
at net.minecraft.server.NetworkManager.b(NetworkManager.java:290)
at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:113)
at net.minecraft.server.ServerConnection.b(SourceFile:39)
at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:595)
at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
Caused by: java.lang.NullPointerException
at net.sacredlabyrinth.Phaed.PreciousStones.managers.PlayerManager.getOutsideFieldLocation(PlayerManager.java:125)
at net.sacredlabyrinth.Phaed.PreciousStones.listeners.PSPlayerListener.onPlayerTeleport(PSPlayerListener.java:313)
at sun.reflect.GeneratedMethodAccessor243.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:339)
... 15 more