Freeze during world saving

During saving my singleplayer world the game freezes, before i opened this world in lan to change my gamemode and change some game rules

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---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 04.03.16 19:52
Description: Manually triggered debug crash

java.lang.Throwable
	at bcf.az(SourceFile:1694)
	at bcf.t(SourceFile:1615)
	at bcf.av(SourceFile:962)
	at bcf.a(SourceFile:392)
	at net.minecraft.client.main.Main.main(SourceFile:124)


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

-- Head --
Stacktrace:
	at bcf.az(SourceFile:1694)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bmt['MessedVices'/231, l='MpServer', x=567,16, y=69,00, z=97,24]]
	Chunk stats: MultiplayerChunkCache: 283, 283
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (248,64,216), Chunk: (at 8,4,8 in 15,13; contains blocks 240,0,208 to 255,255,223), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 26893 game time, 13764 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: 51 total; [aai['container.minecart'/259, l='MpServer', x=495,50, y=21,06, z=124,50], za['Zombie'/265, l='MpServer', x=510,50, y=24,00, z=109,50], yw['Skelett'/266, l='MpServer', x=510,50, y=37,00, z=104,50], we['Schaf'/267, l='MpServer', x=508,44, y=79,00, z=118,79], aai['container.minecart'/268, l='MpServer', x=501,50, y=23,06, z=135,50], vu['Fledermaus'/269, l='MpServer', x=503,25, y=25,10, z=139,45], aai['container.minecart'/270, l='MpServer', x=498,50, y=23,06, z=154,50], aai['container.minecart'/271, l='MpServer', x=498,50, y=23,06, z=159,50], wc['Schwein'/272, l='MpServer', x=499,48, y=89,00, z=153,70], wc['Schwein'/273, l='MpServer', x=497,50, y=88,00, z=160,75], wc['Schwein'/274, l='MpServer', x=508,34, y=80,00, z=166,50], wc['Schwein'/275, l='MpServer', x=506,49, y=81,00, z=157,66], bmt['MessedVices'/231, l='MpServer', x=567,16, y=69,00, z=97,24], aai['container.minecart'/287, l='MpServer', x=519,50, y=22,06, z=121,50], aai['container.minecart'/288, l='MpServer', x=523,50, y=20,06, z=114,50], we['Schaf'/289, l='MpServer', x=515,50, y=80,00, z=124,50], we['Schaf'/290, l='MpServer', x=516,50, y=80,00, z=124,50], we['Schaf'/291, l='MpServer', x=512,74, y=79,00, z=128,50], yi['Creeper'/428, l='MpServer', x=623,50, y=23,00, z=42,50], yi['Creeper'/429, l='MpServer', x=623,50, y=23,00, z=42,50], aai['container.minecart'/305, l='MpServer', x=533,50, y=22,06, z=94,50], aai['container.minecart'/306, l='MpServer', x=538,50, y=19,06, z=103,50], yw['Skelett'/307, l='MpServer', x=541,50, y=29,00, z=98,50], yd['item.item.seeds'/308, l='MpServer', x=539,88, y=64,00, z=96,05], aai['container.minecart'/309, l='MpServer', x=540,50, y=20,06, z=125,50], yc['Fallender Block'/310, l='MpServer', x=535,50, y=25,50, z=164,50], wg['Tintenfisch'/320, l='MpServer', x=541,08, y=62,29, z=36,84], wg['Tintenfisch'/321, l='MpServer', x=547,61, y=62,38, z=43,34], wk['Pferd'/322, l='MpServer', x=559,26, y=66,00, z=52,66], wk['Pferd'/323, l='MpServer', x=558,29, y=66,00, z=53,89], yi['Creeper'/324, l='MpServer', x=544,50, y=27,00, z=115,50], aai['container.minecart'/325, l='MpServer', x=551,50, y=19,06, z=138,50], aai['container.minecart'/326, l='MpServer', x=547,50, y=19,06, z=134,88], za['Zombie'/327, l='MpServer', x=548,50, y=19,00, z=140,50], wc['Schwein'/329, l='MpServer', x=547,22, y=80,00, z=167,51], wc['Schwein'/330, l='MpServer', x=546,42, y=80,00, z=171,70], wc['Schwein'/331, l='MpServer', x=550,46, y=82,00, z=175,26], yw['Skelett'/459, l='MpServer', x=625,50, y=71,00, z=84,50], rx['Erfahrungskugel'/337, l='MpServer', x=562,22, y=62,00, z=119,96], aai['container.minecart'/338, l='MpServer', x=564,50, y=23,06, z=133,50], wk['Pferd'/339, l='MpServer', x=569,84, y=63,00, z=135,55], we['Schaf'/348, l='MpServer', x=584,75, y=64,00, z=136,67], yi['Creeper'/481, l='MpServer', x=531,50, y=24,00, z=156,50], za['Zombie'/232, l='MpServer', x=560,50, y=20,00, z=106,50], wk['Pferd'/365, l='MpServer', x=623,50, y=73,00, z=35,50], wk['Pferd'/366, l='MpServer', x=623,39, y=74,00, z=41,26], wk['Pferd'/367, l='MpServer', x=623,65, y=74,00, z=40,04], vu['Fledermaus'/368, l='MpServer', x=621,82, y=39,80, z=54,51], yi['Creeper'/496, l='MpServer', x=520,50, y=23,00, z=150,50], yi['Creeper'/373, l='MpServer', x=633,50, y=32,00, z=46,50], wk['Pferd'/374, l='MpServer', x=628,50, y=74,00, z=37,50]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bku.a(SourceFile:365)
	at bcf.b(SourceFile:2515)
	at bcf.a(SourceFile:401)
	at net.minecraft.client.main.Main.main(SourceFile:124)

-- System Details --
Details:
	Minecraft Version: 1.9
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 1926929152 bytes (1837 MB) / 2112618496 bytes (2014 MB) up to 4260102144 bytes (4062 MB)
	JVM Flags: 5 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -Xincgc -Xms2048m -Xmx4096m
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 1.9
	LWJGL: 2.9.4
	OpenGL: GeForce 930M/PCIe/SSE2 GL version 4.5.0 NVIDIA 354.35, 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: No
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: MONDO_GUI_EDIT_1.9.zip
	Current Language: Deutsch (Deutschland)
	Profiler Position: N/A (disabled)
	CPU: 4x Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz