When TNT explodes and minecraft crashes I get this report

— Minecraft Crash Report ----
// But it works on my machine.

Time: 09/07/14 19:28
Description: Ticking entity

java.lang.IllegalArgumentException: Cannot get property bci

{name=extended, clazz=class java.lang.Boolean, values=[true, false]}

as it does not exist!
at bbw.b(SourceFile:91)
at bbk.b(SourceFile:66)
at bcw.a(SourceFile:505)
at apm.a(SourceFile:274)
at aph.a(SourceFile:199)
at qg.a(SourceFile:809)
at apm.a(SourceFile:1615)
at adm.k(SourceFile:84)
at adm.j(SourceFile:75)
at apm.a(SourceFile:1370)
at qg.a(SourceFile:572)
at apm.g(SourceFile:1348)
at apm.i(SourceFile:1253)
at qg.i(SourceFile:450)
at net.minecraft.server.MinecraftServer.x(SourceFile:586)
at net.minecraft.server.MinecraftServer.w(SourceFile:510)
at cwg.w(SourceFile:132)
at net.minecraft.server.MinecraftServer.run(SourceFile:426)
at java.lang.Thread.run(Unknown Source)

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

– Head –
Stacktrace:
at bbw.b(SourceFile:91)
at bbk.b(SourceFile:66)
at bcw.a(SourceFile:505)
at apm.a(SourceFile:274)
at aph.a(SourceFile:199)
at qg.a(SourceFile:809)
at apm.a(SourceFile:1615)
at adm.k(SourceFile:84)
at adm.j(SourceFile:75)
at apm.a(SourceFile:1370)
at qg.a(SourceFile:572)
at apm.g(SourceFile:1348)

– Entity being ticked –
Details:
Entity Type: PrimedTnt (adm)
Entity ID: 519904
Entity Name: Block of TNT
Entity's Exact location: -291.25, 57.00, -363.49
Entity's Block location: -292.00,57.00,-364.00 - World: (-292,57,-364), Chunk: (at 12,3,4 in -19,-23; contains blocks -304,0,-368 to -289,255,-353), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Entity's Momentum: 0.00, -0.00, 0.00
Entity's Rider: ~_ERROR~ NullPointerException: null
Entity's Vehicle: ~_ERROR~ NullPointerException: null
Stacktrace:
at apm.i(SourceFile:1253)
at qg.i(SourceFile:450)

– Affected level –
Details:
Level name: Snapshot Testing
All players: 1 total; [qj['nathandow6010'/16, l='Snapshot Testing', x=-296.62, y=57.08, z=-362.04]]
Chunk stats: ServerChunkCache: 625 Drop: 0
Level seed: -6096172918509763564
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options: 3;minecraft:bedrock,3*minecraft:stone,52*minecraft:sandstone;2;
Level spawn location: -292.00,4.00,-354.00 - World: (-292,4,-354), Chunk: (at 12,0,14 in -19,-23; contains blocks -304,0,-368 to -289,255,-353), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Level time: 5805 game time, 5805 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 66901 (now: false), thunder time: 140248 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.x(SourceFile:586)
at net.minecraft.server.MinecraftServer.w(SourceFile:510)
at cwg.w(SourceFile:132)
at net.minecraft.server.MinecraftServer.run(SourceFile:426)
at java.lang.Thread.run(Unknown Source)

– System Details –
Details:
Minecraft Version: 14w28a
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_05, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 162529528 bytes (155 MB) / 452460544 bytes (431 MB) up to 1908932608 bytes (1820 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [qj['nathandow6010'/16, l='Snapshot Testing', x=-296.62, y=57.08, z=-362.04]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.