Game crashes when on realm

Minecraft Crash Report ----
// Would you like a cupcake?

Time: 6/22/16 1:58 PM
Description: Server forgot to send required information to construct BlockEntity

java.lang.RuntimeException: Missing BlockEntity
at bqy.b(SourceFile:162)
at bqu.a(SourceFile:100)
at bqu.run(SourceFile:43)
at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:
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– BlockEntity missing instance data –
Details:
BlockState: minecraft:piston_extension[facing=up,type=sticky]
Block coordinates: World: (2171,4,-364), Chunk: (at 11,0,4 in 135,-23; contains blocks 2160,0,-368 to 2175,255,-353), Region: (4,-1; contains chunks 128,-32 to 159,-1, blocks 2048,0,-512 to 2559,255,-1)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bnn['TinyTanker44'/10176902, l='MpServer', x=2159.17, y=10.98, z=-449.53]]
Chunk stats: MultiplayerChunkCache: 441, 441
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (2111,4,-242), Chunk: (at 15,0,14 in 131,-16; contains blocks 2096,0,-256 to 2111,255,-241), Region: (4,-1; contains chunks 128,-32 to 159,-1, blocks 2048,0,-512 to 2559,255,-1)
Level time: 378748 game time, 177208 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: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 20 total; [bnn['TinyTanker44'/10176902, l='MpServer', x=2159.17, y=10.98, z=-449.53], wd['Chicken'/10176912, l='MpServer', x=2211.32, y=4.00, z=-397.19], xz['entity.ItemFrame.name'/176, l='MpServer', x=2138.03, y=6.50, z=-325.50], xz['entity.ItemFrame.name'/177, l='MpServer', x=2138.03, y=7.50, z=-327.50], wd['Chicken'/10176906, l='MpServer', x=2146.37, y=4.00, z=-373.20], xz['entity.ItemFrame.name'/178, l='MpServer', x=2138.03, y=7.50, z=-326.50], wd['Chicken'/10176905, l='MpServer', x=2118.92, y=4.00, z=-390.13], xz['entity.ItemFrame.name'/179, l='MpServer', x=2138.03, y=7.50, z=-324.50], yk['item.item.egg'/10176904, l='MpServer', x=2119.34, y=4.00, z=-386.70], xz['entity.ItemFrame.name'/180, l='MpServer', x=2138.03, y=6.50, z=-324.50], yk['item.item.egg'/10176911, l='MpServer', x=2208.72, y=4.00, z=-422.88], xz['entity.ItemFrame.name'/181, l='MpServer', x=2138.03, y=6.50, z=-326.50], wd['Chicken'/10176910, l='MpServer', x=2213.12, y=4.00, z=-420.65], xz['entity.ItemFrame.name'/182, l='MpServer', x=2138.03, y=6.50, z=-327.50], wl['Sheep'/10176909, l='MpServer', x=2189.85, y=4.00, z=-427.85], xz['entity.ItemFrame.name'/183, l='MpServer', x=2138.03, y=7.50, z=-325.50], wd['Chicken'/10176908, l='MpServer', x=2168.58, y=4.00, z=-419.86], xz['entity.ItemFrame.name'/184, l='MpServer', x=2138.03, y=6.50, z=-323.50], xz['entity.ItemFrame.name'/185, l='MpServer', x=2138.03, y=7.50, z=-323.50], wd['Chicken'/10176903, l='MpServer', x=2124.11, y=4.00, z=-386.46]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Non-integrated multiplayer server
Stacktrace:
at bln.a(SourceFile:364)
at bcx.b(SourceFile:2535)
at bqu.run(SourceFile:49)
at java.lang.Thread.run(Thread.java:745)

– System Details –
Details:
Minecraft Version: 1.10.1
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: 90126200 bytes (85 MB) / 335880192 bytes (320 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: 0, tallocated: 0
Launched Version: 1.10.1
LWJGL: 2.9.4
OpenGL: ~_ERROR~ RuntimeException: No OpenGL context found in the current thread.
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: resources.zip
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 4x Intel(R) Core(TM) i3-5020U CPU @ 2.20GHz