Put the summary of the bug you're having here
I was playing single player, and was lagging a bit. I was just about to break some blocks and start building when the game crashed and the client said this.
---- Minecraft Crash Report ----
// You're mean.

Time: 10/17/15 1:34 PM
Description: Exception ticking world

java.lang.IllegalStateException: TickNextTick list out of synch
at le.a(SourceFile:495)
at le.c(SourceFile:199)
at net.minecraft.server.MinecraftServer.B(SourceFile:599)
at net.minecraft.server.MinecraftServer.A(SourceFile:535)
at bpo.A(SourceFile:152)
at net.minecraft.server.MinecraftServer.run(SourceFile:451)
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 le.a(SourceFile:495)
at le.c(SourceFile:199)

– Affected level –
Details:
Level name: Intergalactic War
All players: 1 total; [lf['Survivalman0259'/354, l='Intergalactic War', x=-101.54, y=88.52, z=77.56]]
Chunk stats: ServerChunkCache: 501 Drop: 0
Level seed: -898985030557032885
Level generator: ID 04 - customized, ver 0. Features enabled: true
Level generator options:

{"coordinateScale":684.412,"heightScale":684.412,"lowerLimitScale":512.0,"upperLimitScale":512.0,"depthNoiseScaleX":200.0,"depthNoiseScaleZ":200.0,"depthNoiseScaleExponent":0.5,"mainNoiseScaleX":80.0,"mainNoiseScaleY":160.0,"mainNoiseScaleZ":80.0,"baseSize":8.5,"stretchY":12.0,"biomeDepthWeight":1.0,"biomeDepthOffset":0.0,"biomeScaleWeight":1.0,"biomeScaleOffset":0.0,"seaLevel":70,"useCaves":true,"useDungeons":true,"dungeonChance":8,"useStrongholds":false,"useVillages":false,"useMineShafts":true,"useTemples":false,"useMonuments":false,"useRavines":true,"useWaterLakes":true,"waterLakeChance":4,"useLavaLakes":false,"lavaLakeChance":80,"useLavaOceans":false,"fixedBiome":3,"biomeSize":4,"riverSize":4,"dirtSize":33,"dirtCount":10,"dirtMinHeight":0,"dirtMaxHeight":100,"gravelSize":33,"gravelCount":8,"gravelMinHeight":0,"gravelMaxHeight":100,"graniteSize":33,"graniteCount":10,"graniteMinHeight":0,"graniteMaxHeight":80,"dioriteSize":33,"dioriteCount":10,"dioriteMinHeight":0,"dioriteMaxHeight":80,"andesiteSize":33,"andesiteCount":10,"andesiteMinHeight":0,"andesiteMaxHeight":80,"coalSize":17,"coalCount":20,"coalMinHeight":0,"coalMaxHeight":100,"ironSize":9,"ironCount":20,"ironMinHeight":0,"ironMaxHeight":64,"goldSize":9,"goldCount":2,"goldMinHeight":0,"goldMaxHeight":32,"redstoneSize":8,"redstoneCount":8,"redstoneMinHeight":0,"redstoneMaxHeight":16,"diamondSize":8,"diamondCount":40,"diamondMinHeight":0,"diamondMaxHeight":255,"lapisSize":7,"lapisCount":1,"lapisCenterHeight":16,"lapisSpread":16}

Level spawn location: 0.00,71.00,0.00 - World: (0,71,0), Chunk: (at 0,4,0 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: 313442 game time, 313442 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 38634 (now: false), thunder time: 145999 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.B(SourceFile:599)
at net.minecraft.server.MinecraftServer.A(SourceFile:535)
at bpo.A(SourceFile:152)
at net.minecraft.server.MinecraftServer.run(SourceFile:451)
at java.lang.Thread.run(Thread.java:745)

– System Details –
Details:
Minecraft Version: 1.8.8
Operating System: Mac OS X (x86_64) version 10.9.5
Java Version: 1.8.0_60, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 198057016 bytes (188 MB) / 1060372480 bytes (1011 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: 13, tallocated: 95
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [lf['Survivalman0259'/354, l='Intergalactic War', x=-101.54, y=88.52, z=77.56]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.
What I expected to happen was...:
I thought the block would break,but
What actually happened was...:
the single player server crashed.

Steps to Reproduce:
I don't know how to reproduce the bug, but i had recently played on snapshot 15w42a and played using wings on a seperate world. The world was saved to the same folder as this one. I realized this and deleted the world from the computer. It was amplified. I also went to the end. My render distance was randomly set to 32, so my game crashed a bit, until I changed it 2, then to 8. The sound was really laggy and bad. I was on creative mode going to the end of a large open are when, right before I broke a block, my game crashed. I later got on and messed around, but the game ran fine.