Blaze Fireballs Cause Crash

Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 12/5/15 11:07 AM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at aaa.a(SourceFile:44)
at zu.m(SourceFile:117)
at ahn.a(SourceFile:1467)
at lp.a(SourceFile:719)
at ahn.g(SourceFile:1445)
at ahn.k(SourceFile:1335)
at lp.k(SourceFile:552)
at net.minecraft.server.MinecraftServer.D(SourceFile:625)
at net.minecraft.server.MinecraftServer.C(SourceFile:553)
at bxz.C(SourceFile:154)
at net.minecraft.server.MinecraftServer.run(SourceFile:457)
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 aaa.a(SourceFile:44)
at zu.m(SourceFile:117)
at ahn.a(SourceFile:1467)
at lp.a(SourceFile:719)
at ahn.g(SourceFile:1445)

– Entity being ticked –
Details:
Entity Type: SmallFireball (aaa)
Entity ID: 364
Entity Name: Small Fireball
Entity's Exact location: 384.58, 54.40, -184.70
Entity's Block location: World: (384,54,-185), Chunk: (at 0,3,7 in 24,-12; contains blocks 384,0,-192 to 399,255,-177), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Entity's Momentum: 0.08, -0.02, -0.05
Entity's Passengers: []
Entity's Vehicle: ~_ERROR~ NullPointerException: null
Stacktrace:
at ahn.k(SourceFile:1335)
at lp.k(SourceFile:552)

– Affected level –
Details:
Level name: Playthrough
All players: 1 total; [lr['Logosnail'/361, l='Playthrough', x=398.03, y=50.00, z=-191.97]]
Chunk stats: ServerChunkCache: 292 Drop: 0
Level seed: 1514616332
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (0,0,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 0 game time, 0 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: ~_ERROR~ NullPointerException: null
Stacktrace:
at net.minecraft.server.MinecraftServer.D(SourceFile:625)
at net.minecraft.server.MinecraftServer.C(SourceFile:553)
at bxz.C(SourceFile:154)
at net.minecraft.server.MinecraftServer.run(SourceFile:457)
at java.lang.Thread.run(Thread.java:745)

– System Details –
Details:
Minecraft Version: 15w49b
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 158896032 bytes (151 MB) / 368386048 bytes (351 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 84
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [lr['Logosnail'/361, l='Playthrough', x=398.03, y=50.00, z=-191.97]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.