Minecraft Potion Crash

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 10.09.13 21:26
Description: Rendering screen

java.lang.NullPointerException
	at ny.f(SourceFile:108)
	at zj.n(SourceFile:184)
	at yx.s(SourceFile:363)
	at yx.a(SourceFile:406)
	at azw.a(SourceFile:188)
	at bak.a(SourceFile:581)
	at azw.a(SourceFile:168)
	at ban.a(SourceFile:30)
	at bak.a(SourceFile:530)
	at bho.b(SourceFile:720)
	at awb.V(SourceFile:713)
	at awb.e(SourceFile:642)
	at net.minecraft.client.main.Main.main(SourceFile:103)


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

-- Head --
Stacktrace:
	at ny.f(SourceFile:108)
	at zj.n(SourceFile:184)
	at yx.s(SourceFile:363)
	at yx.a(SourceFile:406)
	at azw.a(SourceFile:188)
	at bak.a(SourceFile:581)
	at azw.a(SourceFile:168)
	at ban.a(SourceFile:30)
	at bak.a(SourceFile:530)

-- Screen render details --
Details:
	Screen name: bak
	Mouse location: Scaled: (402, 247). Absolute: (1205, 394)
	Screen size: Scaled: (675, 379). Absolute: (2023, 1137). Scale factor of 3

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfn['3_2_1_booom'/40, l='MpServer', x=112,31, y=65,62, z=-57,70]]
	Chunk stats: MultiplayerChunkCache: 225, 225
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options:
	Level spawn location: World: (192,4,-55), Chunk: (at 0,0,9 in 12,-4; contains blocks 192,0,-64 to 207,255,-49), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Level time: 12927 game time, 1093 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: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 21 total; [tw['Creeper'/0, l='MpServer', x=41,00, y=60,00, z=-64,50], tw['Creeper'/34, l='MpServer', x=185,50, y=21,00, z=-90,50], sd['Bat'/1, l='MpServer', x=44,75, y=61,10, z=-61,75], sd['Bat'/2, l='MpServer', x=36,63, y=17,10, z=-47,25], un['Zombie'/32, l='MpServer', x=186,52, y=20,44, z=-86,69], tw['Creeper'/33, l='MpServer', x=185,50, y=21,00, z=-89,50], sr['Squid'/5, l='MpServer', x=61,47, y=61,00, z=-43,56], sr['Squid'/7, l='MpServer', x=70,50, y=62,00, z=-50,50], sr['Squid'/8, l='MpServer', x=64,53, y=61,07, z=-45,53], bfn['3_2_1_booom'/40, l='MpServer', x=112,31, y=65,62, z=-57,70], sd['Bat'/17, l='MpServer', x=90,99, y=27,79, z=-23,63], tw['Creeper'/19, l='MpServer', x=88,50, y=27,43, z=-14,91], sd['Bat'/18, l='MpServer', x=90,39, y=27,12, z=-11,52], sd['Bat'/21, l='MpServer', x=92,43, y=29,22, z=-15,72], ui['Skeleton'/20, l='MpServer', x=86,50, y=28,00, z=-14,38], sd['Bat'/22, l='MpServer', x=93,90, y=27,26, z=-17,65], sg['Cow'/25, l='MpServer', x=119,04, y=64,00, z=-17,03], sg['Cow'/24, l='MpServer', x=120,23, y=64,00, z=-31,66], sg['Cow'/27, l='MpServer', x=133,97, y=64,00, z=-20,03], sg['Cow'/26, l='MpServer', x=125,31, y=64,00, z=-14,31], sd['Bat'/31, l='MpServer', x=183,25, y=21,10, z=-90,50]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bfi.a(SourceFile:285)
	at awb.b(SourceFile:1813)
	at awb.e(SourceFile:651)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w36b
	Operating System: Mac OS X (x86_64) version 10.7.5
	Java Version: 1.6.0_51, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 80404872 bytes (76 MB) / 272703488 bytes (260 MB) up to 1065025536 bytes (1015 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 582 (32592 bytes; 0 MB) allocated, 489 (27384 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 13w36b
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 6770M OpenGL Engine GL version 2.1 ATI-7.32.12, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: Canadian English (CA)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 867 (48552 bytes; 0 MB) allocated, 162 (9072 bytes; 0 MB) used