Crashes repeatably when placing the held dirt block with
java.lang.NullPointerException: Unexpected error

Have been able to repeat it multiple times now from the same save.
Even adding the 20 extra dirt to the stack from the inventory and then placing all of those before still makes it crash upon placing the last block of dirt.
Correction: placing any of the last in the stack of any items from the hotbar seems to provoke this
See linked save and bug report from launcher below:

Save:
https://dl.dropboxusercontent.com/u/13348293/Cone.zip

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

Time: 02-12-15 21:09
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at rx.a_(SourceFile:409)
at zo.a(SourceFile:1818)
at rx.a(SourceFile:1198)
at bbz.au(SourceFile:1435)
at bbz.ax(SourceFile:1934)
at bbz.aw(SourceFile:1752)
at bbz.s(SourceFile:1596)
at bbz.as(SourceFile:942)
at bbz.a(SourceFile:386)
at net.minecraft.client.main.Main.main(SourceFile:122)

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

– Head –
Stacktrace:
at rx.a_(SourceFile:409)
at zo.a(SourceFile:1818)
at rx.a(SourceFile:1198)
at bbz.au(SourceFile:1435)
at bbz.ax(SourceFile:1934)
at bbz.aw(SourceFile:1752)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bmg['Echo51'/447, l='MpServer', x=-20,33, y=69,00, z=226,47]]
Chunk stats: MultiplayerChunkCache: 1681, 1681
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-12,64,252), Chunk: (at 4,4,12 in -1,15; contains blocks -16,0,240 to -1,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 543068 game time, 652968 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: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 141 total; [yn['Creeper'/257, l='MpServer', x=23,50, y=33,00, z=149,50], zf['Zombie'/258, l='MpServer', x=24,50, y=22,00, z=174,50], zf['Zombie'/259, l='MpServer', x=24,34, y=18,00, z=172,34], yn['Creeper'/260, l='MpServer', x=23,50, y=24,00, z=174,50], wa['Sheep'/261, l='MpServer', x=21,16, y=64,00, z=165,72], vu['Cow'/262, l='MpServer', x=20,47, y=66,00, z=219,84], zb['Skeleton'/263, l='MpServer', x=22,50, y=27,00, z=249,50], zd['Spider'/264, l='MpServer', x=22,50, y=27,00, z=252,50], zd['Spider'/265, l='MpServer', x=20,50, y=28,00, z=246,50], zf['Zombie'/266, l='MpServer', x=19,50, y=37,00, z=251,50], vu['Cow'/267, l='MpServer', x=24,16, y=68,00, z=251,94], xz['item.item.bone'/268, l='MpServer', x=24,44, y=68,00, z=241,44], vq['Bat'/269, l='MpServer', x=23,31, y=34,05, z=264,33], vq['Bat'/270, l='MpServer', x=30,22, y=36,10, z=269,44], yn['Creeper'/271, l='MpServer', x=31,50, y=53,00, z=259,50], zf['Zombie'/272, l='MpServer', x=29,34, y=16,00, z=286,13], zf['Zombie'/273, l='MpServer', x=28,44, y=31,00, z=275,81], zf['Zombie'/274, l='MpServer', x=31,50, y=31,00, z=272,50], zb['Skeleton'/275, l='MpServer', x=28,50, y=31,00, z=272,50], zf['Zombie'/276, l='MpServer', x=25,50, y=34,00, z=276,06], yn['Creeper'/277, l='MpServer', x=31,66, y=12,00, z=293,09], zf['Zombie'/278, l='MpServer', x=21,43, y=44,00, z=299,03], zb['Skeleton'/279, l='MpServer', x=24,50, y=49,00, z=299,50], yn['Creeper'/289, l='MpServer', x=46,50, y=35,00, z=199,50], yn['Creeper'/290, l='MpServer', x=46,50, y=35,00, z=199,50], xz['item.item.rottenFlesh'/291, l='MpServer', x=33,13, y=67,00, z=209,16], vu['Cow'/292, l='MpServer', x=32,91, y=69,00, z=239,94], zf['Zombie'/293, l='MpServer', x=47,47, y=30,00, z=296,84], vq['Bat'/299, l='MpServer', x=53,72, y=56,10, z=155,47], bmg['Echo51'/447, l='MpServer', x=-20,33, y=69,00, z=226,47], yn['Creeper'/300, l='MpServer', x=54,63, y=55,00, z=149,03], vu['Cow'/301, l='MpServer', x=59,03, y=71,00, z=154,84], vu['Cow'/303, l='MpServer', x=59,47, y=71,00, z=155,78], vy['Pig'/305, l='MpServer', x=56,75, y=69,00, z=280,81], vu['Cow'/85, l='MpServer', x=-96,22, y=68,00, z=201,03], zb['Skeleton'/88, l='MpServer', x=-97,50, y=38,00, z=237,50], ze['Witch'/89, l='MpServer', x=-97,50, y=38,00, z=235,50], vu['Cow'/93, l='MpServer', x=-93,44, y=70,00, z=280,71], zb['Skeleton'/102, l='MpServer', x=-86,50, y=18,00, z=160,50], vu['Cow'/104, l='MpServer', x=-88,72, y=64,00, z=214,53], vu['Cow'/105, l='MpServer', x=-84,56, y=65,00, z=209,53], vu['Cow'/106, l='MpServer', x=-83,50, y=65,00, z=217,00], yn['Creeper'/109, l='MpServer', x=-83,50, y=18,00, z=253,50], zf['Zombie'/110, l='MpServer', x=-86,50, y=14,00, z=277,50], vu['Cow'/111, l='MpServer', x=-81,84, y=70,00, z=295,50], zb['Skeleton'/122, l='MpServer', x=-75,50, y=15,00, z=167,50], zf['Zombie'/123, l='MpServer', x=-73,50, y=47,00, z=190,50], vu['Cow'/124, l='MpServer', x=-73,47, y=68,00, z=183,84], zf['Zombie'/125, l='MpServer', x=-76,06, y=48,00, z=188,50], zf['Zombie'/126, l='MpServer', x=-73,31, y=48,00, z=192,81], vu['Cow'/127, l='MpServer', x=-74,72, y=69,00, z=199,44], vu['Cow'/128, l='MpServer', x=-78,25, y=65,00, z=218,50], vu['Cow'/129, l='MpServer', x=-73,50, y=67,00, z=229,81], vq['Bat'/130, l='MpServer', x=-70,96, y=15,15, z=260,78], yn['Creeper'/131, l='MpServer', x=-79,50, y=16,00, z=263,50], yn['Creeper'/132, l='MpServer', x=-77,50, y=14,00, z=279,50], vq['Bat'/133, l='MpServer', x=-66,46, y=16,73, z=285,53], vu['Cow'/134, l='MpServer', x=-70,38, y=70,00, z=282,53], vq['Bat'/141, l='MpServer', x=-62,78, y=47,10, z=166,75], vq['Bat'/142, l='MpServer', x=-61,27, y=46,98, z=167,69], zb['Skeleton'/143, l='MpServer', x=-53,50, y=40,00, z=199,50], yn['Creeper'/144, l='MpServer', x=-55,50, y=40,00, z=199,50], yn['Creeper'/145, l='MpServer', x=-58,50, y=40,00, z=199,50], vq['Bat'/146, l='MpServer', x=-60,43, y=37,12, z=190,98], vu['Cow'/147, l='MpServer', x=-58,00, y=66,00, z=256,09], vu['Cow'/148, l='MpServer', x=-59,53, y=68,00, z=271,28], vu['Cow'/149, l='MpServer', x=-54,09, y=66,59, z=280,53], vu['Cow'/150, l='MpServer', x=-48,78, y=69,00, z=280,19], wa['Sheep'/154, l='MpServer', x=-40,81, y=70,00, z=157,19], wa['Sheep'/155, l='MpServer', x=-39,47, y=70,00, z=158,19], wa['Sheep'/156, l='MpServer', x=-42,22, y=70,00, z=156,50], wa['Sheep'/157, l='MpServer', x=-42,97, y=70,00, z=155,06], wa['Sheep'/158, l='MpServer', x=-39,47, y=70,00, z=159,53], wa['Sheep'/159, l='MpServer', x=-44,94, y=70,00, z=156,69], wa['Sheep'/160, l='MpServer', x=-44,94, y=70,00, z=158,70], wa['Sheep'/161, l='MpServer', x=-43,47, y=70,00, z=157,13], wa['Sheep'/162, l='MpServer', x=-41,72, y=70,00, z=158,84], wa['Sheep'/163, l='MpServer', x=-42,88, y=70,00, z=158,38], wa['Sheep'/164, l='MpServer', x=-43,03, y=70,00, z=159,53], wa['Sheep'/165, l='MpServer', x=-44,94, y=70,00, z=155,06], wa['Sheep'/167, l='MpServer', x=-43,53, y=70,00, z=156,00], wa['Sheep'/168, l='MpServer', x=-40,56, y=70,00, z=155,78], wa['Sheep'/169, l='MpServer', x=-44,26, y=70,00, z=158,07], wa['Sheep'/170, l='MpServer', x=-45,16, y=70,00, z=159,75], wa['Sheep'/171, l='MpServer', x=-36,22, y=70,00, z=155,06], wa['Sheep'/172, l='MpServer', x=-33,75, y=70,00, z=159,81], wa['Sheep'/173, l='MpServer', x=-40,25, y=70,00, z=158,97], wa['Sheep'/175, l='MpServer', x=-40,41, y=70,00, z=159,66], wa['Sheep'/176, l='MpServer', x=-34,22, y=70,00, z=155,75], vu['Cow'/177, l='MpServer', x=-40,38, y=70,00, z=164,31], vu['Cow'/178, l='MpServer', x=-39,46, y=70,00, z=162,95], vu['Cow'/179, l='MpServer', x=-42,94, y=70,00, z=162,16], vu['Cow'/180, l='MpServer', x=-41,69, y=70,00, z=161,91], vu['Cow'/181, l='MpServer', x=-39,84, y=70,00, z=161,44], xz['item.tile.dirt.default'/182, l='MpServer', x=-40,19, y=70,00, z=165,25], wa['Sheep'/183, l='MpServer', x=-37,53, y=70,00, z=160,81], vq['Bat'/184, l='MpServer', x=-34,13, y=55,10, z=183,75], vq['Bat'/185, l='MpServer', x=-33,57, y=51,87, z=185,51], vq['Bat'/186, l='MpServer', x=-43,41, y=49,01, z=197,10], yn['Creeper'/187, l='MpServer', x=-45,00, y=49,00, z=192,53], vu['Cow'/188, l='MpServer', x=-45,09, y=68,00, z=267,91], vu['Cow'/189, l='MpServer', x=-43,16, y=66,00, z=257,09], zd['Spider'/196, l='MpServer', x=-20,50, y=43,00, z=184,50], wc['Squid'/197, l='MpServer', x=-24,72, y=61,40, z=197,96], xz['item.tile.dirt.default'/198, l='MpServer', x=-17,03, y=61,00, z=215,88], vy['Pig'/199, l='MpServer', x=-29,53, y=65,00, z=249,19], vy['Pig'/200, l='MpServer', x=-17,31, y=70,00, z=283,03], vq['Bat'/201, l='MpServer', x=-21,00, y=32,15, z=291,41], vu['Cow'/202, l='MpServer', x=-21,47, y=67,00, z=292,06], wc['Squid'/209, l='MpServer', x=-6,61, y=62,53, z=195,37], wc['Squid'/210, l='MpServer', x=0,98, y=57,43, z=203,53], yn['Creeper'/211, l='MpServer', x=-4,63, y=47,00, z=219,19], wc['Squid'/212, l='MpServer', x=-11,67, y=47,00, z=217,15], vq['Bat'/213, l='MpServer', x=6,66, y=43,08, z=225,40], xz['item.tile.dirt.default'/214, l='MpServer', x=-15,97, y=61,00, z=217,66], zf['Zombie'/215, l='MpServer', x=-8,47, y=35,00, z=266,94], zf['Zombie'/216, l='MpServer', x=-14,50, y=34,00, z=269,50], vu['Cow'/217, l='MpServer', x=-14,97, y=68,00, z=271,06], vy['Pig'/218, l='MpServer', x=-14,34, y=69,00, z=276,09], vu['Cow'/219, l='MpServer', x=-2,56, y=65,00, z=300,84], vy['Pig'/220, l='MpServer', x=-14,59, y=64,00, z=299,16], vu['Cow'/221, l='MpServer', x=-9,88, y=64,00, z=300,88], wa['Sheep'/222, l='MpServer', x=-5,47, y=65,00, z=303,44], vy['Pig'/229, l='MpServer', x=14,44, y=63,00, z=150,03], zf['Zombie'/230, l='MpServer', x=4,63, y=29,00, z=179,63], zf['Zombie'/231, l='MpServer', x=4,34, y=29,00, z=182,34], zf['Zombie'/232, l='MpServer', x=4,66, y=29,00, z=183,34], wc['Squid'/233, l='MpServer', x=8,30, y=62,59, z=196,28], zf['Zombie'/234, l='MpServer', x=12,50, y=44,00, z=230,50], yn['Creeper'/235, l='MpServer', x=10,50, y=33,00, z=248,50], zf['Zombie'/236, l='MpServer', x=8,50, y=32,00, z=247,50], zf['Zombie'/237, l='MpServer', x=6,50, y=35,00, z=253,50], yn['Creeper'/238, l='MpServer', x=4,50, y=39,00, z=257,50], vu['Cow'/239, l='MpServer', x=9,50, y=66,00, z=284,41], vu['Cow'/240, l='MpServer', x=7,53, y=70,00, z=277,97], vu['Cow'/241, l='MpServer', x=7,84, y=66,00, z=284,53], vu['Cow'/242, l='MpServer', x=14,44, y=70,00, z=286,72], zb['Skeleton'/243, l='MpServer', x=15,50, y=44,00, z=303,50], wa['Sheep'/244, l='MpServer', x=9,47, y=66,00, z=296,91], vu['Cow'/245, l='MpServer', x=6,22, y=66,00, z=298,47], wa['Sheep'/246, l='MpServer', x=1,44, y=66,00, z=301,59]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bkh.a(SourceFile:364)
at bbz.b(SourceFile:2496)
at bbz.a(SourceFile:400)
at net.minecraft.client.main.Main.main(SourceFile:122)

– System Details –
Details:
Minecraft Version: 15w49a
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 304128488 bytes (290 MB) / 756199424 bytes (721 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 15w49a
LWJGL: 2.9.4
OpenGL: GeForce GTX 770/PCIe/SSE2 GL version 4.5.0 NVIDIA 353.30, NVIDIA Corporation
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: Yes
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: echopack (incompatible)
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 4x Intel(R) Core(TM) i5-4590 CPU @ 3.30GHz