I was testing a boss fight on my adventure map, and when i was killed by a fireball, game crashed.

---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 24.08.14 13:53
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at apf.b(SourceFile:222)
at wv.a(SourceFile:1975)
at ahn.a(SourceFile:35)
at ahj.s_(SourceFile:148)
at aqs.a(SourceFile:1406)
at qt.a(SourceFile:601)
at aqs.g(SourceFile:1384)
at aqs.i(SourceFile:1277)
at qt.i(SourceFile:479)
at net.minecraft.server.MinecraftServer.z(SourceFile:607)
at net.minecraft.server.MinecraftServer.y(SourceFile:531)
at cyf.y(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:447)
at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Stacktrace:
at apf.b(SourceFile:222)
at wv.a(SourceFile:1975)
at ahn.a(SourceFile:35)
at ahj.s_(SourceFile:148)
at aqs.a(SourceFile:1406)
at qt.a(SourceFile:601)
at aqs.g(SourceFile:1384)

– Entity being ticked –
Details:
Entity Type: SmallFireball (ahn)
Entity ID: 7858
Entity Name: Small Fireball
Entity's Exact location: -804,28, 41,68, 121,88
Entity's Block location: -805,00,41,00,121,00 - World: (-805,41,121), Chunk: (at 11,2,9 in -51,7; contains blocks -816,0,112 to -801,255,127), Region: (-2,0; contains chunks -64,0 to -33,31, blocks -1024,0,0 to -513,255,511)
Entity's Momentum: 0,01, 0,08, 1,40
Entity's Rider: ~_ERROR~ NullPointerException: null
Entity's Vehicle: ~_ERROR~ NullPointerException: null
Stacktrace:
at aqs.i(SourceFile:1277)
at qt.i(SourceFile:479)

– Affected level –
Details:
Level name: mc_racemap
All players: 1 total; [qw['MetoolDaddy'/13, l='mc_racemap', x=-803,75, y=40,00, z=122,65]]
Chunk stats: ServerChunkCache: 256 Drop: 0
Level seed: -2755955384472597259
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options: 3;minecraft:bedrock,3*minecraft:stone,52*minecraft:sandstone;2;
Level spawn location: -797,00,56,00,111,00 - World: (-797,56,111), Chunk: (at 3,3,15 in -50,6; contains blocks -800,0,96 to -785,255,111), Region: (-2,0; contains chunks -64,0 to -33,31, blocks -1024,0,0 to -513,255,511)
Level time: 504876 game time, 5950 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 133587 (now: false), thunder time: 70362 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.z(SourceFile:607)
at net.minecraft.server.MinecraftServer.y(SourceFile:531)
at cyf.y(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:447)
at java.lang.Thread.run(Thread.java:745)

– System Details –
Details:
Minecraft Version: 1.8-pre1
Operating System: Linux (i386) version 3.13.0-34-generic
Java Version: 1.7.0_65, Oracle Corporation
Java VM Version: OpenJDK Server VM (mixed mode), Oracle Corporation
Memory: 80541904 bytes (76 MB) / 301895680 bytes (287 MB) up to 523501568 bytes (499 MB)
JVM Flags: 5 total; -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [qw['MetoolDaddy'/13, l='mc_racemap', x=-803,75, y=40,00, z=122,65]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.