java.lang.ArrayIndexOutOfBoundsException: -11
at com.flansmod.common.guns.EntityBullet.func_70071_h_(EntityBullet.java:284) ~[EntityBullet.class:?]
at net.minecraft.world.World.func_72866_a(World.java:2610) ~[ahb.class:?]
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:834) ~[mt.class:?]
at net.minecraft.world.World.func_72870_g(World.java:2563) ~[ahb.class:?]
at net.minecraft.world.World.func_72939_s(World.java:2375) ~[ahb.class:?]
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:665) ~[mt.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:937) ~[MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:422) ~[lt.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:803) ~[MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:663) [MinecraftServer.class:?]
at java.lang.Thread.run(Thread.java:745) [?:1.7.0_72]

Happened around 10 times already

This is happening on the server.

Haven't seen this for a long time. Assuming fixed in more recent versions.

Could we have the full crash log via http://pastebin.com, forge version, mod version and any details on how to cause this if possible?

http://pastebin.com/9q4R4H4s
the locations are censored, the bug seems to happen if someone shoots a bullet (random time until that happens), Flan's mod version 4.8.0