Hopper: java.lang.NullPointerException: Starting integrated server

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-2555344/

Crash:

java.lang.NullPointerException: Starting integrated server
	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:213)
	at com.google.common.collect.Lists$ReverseList.<init>(Lists.java:767)
	at com.google.common.collect.Lists.reverse(Lists.java:759)
	at mb.b(SourceFile:184)
	at mb.<init>(SourceFile:63)

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

---- Minecraft Crash Report ----
// I bet Cylons wouldn't have this problem.

Time: 9/2/15 9:15 AM
Description: Starting integrated server

java.lang.NullPointerException: Starting integrated server
	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:213)
	at com.google.common.collect.Lists$ReverseList.<init>(Lists.java:767)
	at com.google.common.collect.Lists.reverse(Lists.java:759)
	at mb.b(SourceFile:184)
	at mb.<init>(SourceFile:63)
	at azo.a(SourceFile:1966)
	at bep.e(SourceFile:220)
	at bep.a(SourceFile:176)
	at bep.a(SourceFile:142)
	at bap.b(SourceFile:41)
	at beo.a(SourceFile:118)
	at bce.k(SourceFile:404)
	at beo.k(SourceFile:50)
	at bce.p(SourceFile:381)
	at azo.s(SourceFile:1535)
	at azo.as(SourceFile:929)
	at azo.a(SourceFile:378)
	at net.minecraft.client.main.Main.main(SourceFile:125)


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

-- Head --
Stacktrace:
	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:213)
	at com.google.common.collect.Lists$ReverseList.<init>(Lists.java:767)
	at com.google.common.collect.Lists.reverse(Lists.java:759)
	at mb.b(SourceFile:184)
	at mb.<init>(SourceFile:63)

-- Starting integrated server --
Details:
	Level ID: think 5
	Level Name: think 5
Stacktrace:
	at azo.a(SourceFile:1966)
	at bep.e(SourceFile:220)
	at bep.a(SourceFile:176)
	at bep.a(SourceFile:142)
	at bap.b(SourceFile:41)
	at beo.a(SourceFile:118)
	at bce.k(SourceFile:404)
	at beo.k(SourceFile:50)
	at bce.p(SourceFile:381)

-- Affected screen --
Details:
	Screen name: beo
Stacktrace:
	at azo.s(SourceFile:1535)
	at azo.as(SourceFile:929)
	at azo.a(SourceFile:378)
	at net.minecraft.client.main.Main.main(SourceFile:125)

-- System Details --
Details:
	Minecraft Version: 15w36c
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.8.0_60, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 161607328 bytes (154 MB) / 215367680 bytes (205 MB) up to 523501568 bytes (499 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 15w36c
	LWJGL: 2.9.4
	OpenGL: RS880 GL version 3.2.9551 Compatibility Profile Context, ATI Technologies Inc.
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: No
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: 
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	CPU: 4x AMD Athlon(tm) II X4 635 Processor

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-2555344/74923367/