Hopper: java.lang.NullPointerException: Ticking entity

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-2564773/

Crash:

java.lang.NullPointerException: Ticking entity
	at ze.m(SourceFile:179)
	at agv.a(SourceFile:1456)
	at lk.a(SourceFile:659)
	at agv.g(SourceFile:1434)

The following is the first clean report made public about this crash:

---- Minecraft Crash Report ----
// I feel sad now :(

Time: 16.09.15 16:28
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
	at ze.m(SourceFile:179)
	at agv.a(SourceFile:1456)
	at lk.a(SourceFile:659)
	at agv.g(SourceFile:1434)
	at agv.k(SourceFile:1328)
	at lk.k(SourceFile:538)
	at net.minecraft.server.MinecraftServer.D(SourceFile:618)
	at net.minecraft.server.MinecraftServer.C(SourceFile:546)
	at bvq.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:450)
	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 ze.m(SourceFile:179)
	at agv.a(SourceFile:1456)
	at lk.a(SourceFile:659)
	at agv.g(SourceFile:1434)

-- Entity being ticked --
Details:
	Entity Type: Arrow (ze)
	Entity ID: 18
	Entity Name: Pfeil
	Entity's Exact location: 49851,88, 63,03, 49980,79
	Entity's Block location: World: (49851,63,49980), Chunk: (at 11,3,12 in 3115,3123; contains blocks 49840,0,49968 to 49855,255,49983), Region: (97,97; contains chunks 3104,3104 to 3135,3135, blocks 49664,0,49664 to 50175,255,50175)
	Entity's Momentum: -0,04, -0,07, 0,00
	Entity's Rider: ~~ERROR~~ NullPointerException: null
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at agv.k(SourceFile:1328)
	at lk.k(SourceFile:538)

-- Affected level --
Details:
	Level name: Neue Welt
	All players: 0 total; []
	Chunk stats: ServerChunkCache: 626 Drop: 0
	Level seed: -9181619912194348184
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (50000,100,50000), Chunk: (at 0,6,0 in 3125,3125; contains blocks 50000,0,50000 to 50015,255,50015), Region: (97,97; contains chunks 3104,3104 to 3135,3135, blocks 49664,0,49664 to 50175,255,50175)
	Level time: 22857 game time, 26704 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 9953 (now: true), thunder time: 137904 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.D(SourceFile:618)
	at net.minecraft.server.MinecraftServer.C(SourceFile:546)
	at bvq.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:450)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 15w38a
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 111805568 bytes (106 MB) / 223879168 bytes (213 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: 11, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Player Count: 0 / 8; []
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-2564773/74982874/