SMP: Failed to save chunk

[10:23:03] [Server thread/ERROR]: Failed to save chunk
e: Saving entity NBT
	at pk.e(SourceFile:1192) ~[minecraft_server.jar:?]
	at pk.d(SourceFile:1150) ~[minecraft_server.jar:?]
	at anj.a(SourceFile:225) ~[minecraft_server.jar:?]
	at anj.a(SourceFile:95) [minecraft_server.jar:?]
	at ld.b(SourceFile:160) [minecraft_server.jar:?]
	at ld.a(SourceFile:204) [minecraft_server.jar:?]
	at le.a(SourceFile:763) [minecraft_server.jar:?]
	at net.minecraft.server.MinecraftServer.a(SourceFile:364) [minecraft_server.jar:?]
	at net.minecraft.server.MinecraftServer.A(SourceFile:553) [minecraft_server.jar:?]
	at net.minecraft.server.MinecraftServer.run(SourceFile:451) [minecraft_server.jar:?]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_05]
Caused by: java.lang.NullPointerException
	at acz.k(SourceFile:129) ~[minecraft_server.jar:?]
	at ada.a(SourceFile:134) ~[minecraft_server.jar:?]
	at wi.b(SourceFile:228) ~[minecraft_server.jar:?]
	at pk.e(SourceFile:1180) ~[minecraft_server.jar:?]
	... 10 more

---- Minecraft Profiler Results ----
// Speedy. Zoooooom!

Time span: 17981 ms
Tick span: 359 ticks
// This is approximately 19.97 ticks per second. It should be 20 ticks per second

--- BEGIN PROFILE DUMP ---

[00] levels - 98.45%/98.45%
[00] jobs - 1.41%/1.41%
[01]  unspecified - 48.65%/0.69%
[01]  travel - 24.26%/0.34%
[02]   move - 52.22%/0.18%
[02]   unspecified - 26.87%/0.09%
[02]   rest - 20.91%/0.07%
[01]  entityBaseTick - 8.98%/0.13%
[02]   unspecified - 95.39%/0.12%
[02]   portal - 4.61%/0.01%
[01]  livingEntityBaseTick - 6.58%/0.09%
[01]  move - 4.60%/0.06%
[01]  rest - 2.90%/0.04%
[01]  ai - 2.11%/0.03%
[02]   unspecified - 73.18%/0.02%
[02]   newAi - 26.82%/0.01%
[01]  push - 1.08%/0.02%
[01]  headTurn - 0.58%/0.01%
[01]  rangeChecks - 0.16%/0.00%
[01]  jump - 0.10%/0.00%
[00] connection - 0.08%/0.08%
[01]  unspecified - 95.48%/0.08%
[01]  keepAlive - 4.52%/0.00%
[00] unspecified - 0.04%/0.04%
[00] tickables - 0.00%/0.00%
[00] players - 0.00%/0.00%
[00] tallying - 0.00%/0.00%
[00] snooper - 0.00%/0.00%
--- END PROFILE DUMP ---