Development Assistance NMS Error?

Basically, this works on craftbukkit but when I attempt to run it on spigot (changed imports to v1_7_R4) it crashes the server.

Error (open) Error (close)

Code:

[17:44:23] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.NullPointerException
    at net.minecraft.server.v1_7_R4.PlayerConnection.sendPacket(PlayerConnection.java:751) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.EntityTrackerEntry.broadcastIncludingSelf(EntityTrackerEntry.java:280) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.EntityTrackerEntry.b(EntityTrackerEntry.java:247) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.EntityTrackerEntry.track(EntityTrackerEntry.java:173) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.EntityTracker.updatePlayers(EntityTracker.java:157) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:723) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
[17:44:23] [Server thread/ERROR]: This crash report has been saved to: D:\Server\.\crash-reports\crash-2015-06-21_17.44.23-server.txt
[17:44:23] [Server thread/INFO]: Stopping server

 

@Flaps maybe you should show us the code.... without we can't help you

 

What works with craftbukkit? Is this a crash with a plugin you're developing, or is it a crash with spigot? If it's the latter, you're in the wrong place. This forum is for the discussion and helping of developers when it comes to plugin development, not issues with trying to use bukkit or spigot.

The reason I'm asking is you've given us minimal information, and I don't see a specific plugin mentioned in that crash log.

 

It's a large plugin, would take awhile to show you all the code.
There is nothing in the stacktrace that focuses on any part of my code.
Here is something that may be related?



I'm using NPCFactory to spawn NPC's for my plugin, they spawn in Craftbukkit but in spigot it crashes the server.

 

@Flaps
Are you using the right version? Are the two compatible?

 

I'm using the same version to compile as the server is running.

 

What packet are you sending, show code for sending it

 

Try to run the server without the plugin. It seems to me that it is something server-related.