Hopper: java.lang.NullPointerException: Ticking entity

java.lang.NullPointerException: Ticking entity
	at xk.s_(SourceFile:96)
	at aqr.a(SourceFile:1406)
	at qt.a(SourceFile:601)
	at aqr.g(SourceFile:1384)

---- Minecraft Crash Report ----
// There are four lights!

Time: 8/19/14 11:41 AM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
	at xk.s_(SourceFile:96)
	at aqr.a(SourceFile:1406)
	at qt.a(SourceFile:601)
	at aqr.g(SourceFile:1384)
	at aqr.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 cyd.y(SourceFile:155)
	at net.minecraft.server.MinecraftServer.run(SourceFile:447)
	at java.lang.Thread.run(Thread.java:695)


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

-- Head --
Stacktrace:
	at xk.s_(SourceFile:96)
	at aqr.a(SourceFile:1406)
	at qt.a(SourceFile:601)
	at aqr.g(SourceFile:1384)

-- Entity being ticked --
Details:
	Entity Type: XPOrb (xk)
	Entity ID: 2507
	Entity Name: Experience Orb
	Entity's Exact location: 1001.12, 24.00, 997.34
	Entity's Block location: 1001.00,24.00,997.00 - World: (1001,24,997), Chunk: (at 9,1,5 in 62,62; contains blocks 992,0,992 to 1007,255,1007), Region: (1,1; contains chunks 32,32 to 63,63, blocks 512,0,512 to 1023,255,1023)
	Entity's Momentum: -0.19, 0.34, 0.18
	Entity's Rider: ~~ERROR~~ NullPointerException: null
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at aqr.i(SourceFile:1277)
	at qt.i(SourceFile:479)

-- Affected level --
Details:
	Level name: Captive Minecraft III
	All players: 1 total; [qw['unknownchasen'/28, l='Captive Minecraft III', x=1001.69, y=23.00, z=1001.64]]
	Chunk stats: ServerChunkCache: 1089 Drop: 0
	Level seed: -3057834051459373274
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 3;0;1;village
	Level spawn location: 1000.00,244.00,1000.00 - World: (1000,244,1000), Chunk: (at 8,15,8 in 62,62; contains blocks 992,0,992 to 1007,255,1007), Region: (1,1; contains chunks 32,32 to 63,63, blocks 512,0,512 to 1023,255,1023)
	Level time: 4544970 game time, 505907 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 1 (now: false), thunder time: 1 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.z(SourceFile:607)
	at net.minecraft.server.MinecraftServer.y(SourceFile:531)
	at cyd.y(SourceFile:155)
	at net.minecraft.server.MinecraftServer.run(SourceFile:447)
	at java.lang.Thread.run(Thread.java:695)

-- System Details --
Details:
	Minecraft Version: 14w34c
	Operating System: Mac OS X (x86_64) version 10.9.4
	Java Version: 1.6.0_65, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 321586088 bytes (306 MB) / 635289600 bytes (605 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 5 total; -Xmx1G -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['unknownchasen'/28, l='Captive Minecraft III', x=1001.69, y=23.00, z=1001.64]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.