Crashes after a server loads up.

Please attach the crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt), otherwise we can not diagnose this issue.
For technical support please use the Mojang Support Center.

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Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 6/22/16 1:14 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 bqt.b(SourceFile:140)
at boh.a(SourceFile:913)
at bnz.a(SourceFile:1237)
at bnz.b(SourceFile:1171)
at bnz.a(SourceFile:1018)
at bcx.av(SourceFile:991)
at bcx.a(SourceFile:396)
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 –
Thread: Client thread
Stacktrace:
at bqy.b(SourceFile:162)

– BlockEntity missing instance data –
Details:
BlockState: minecraft:hopper[enabled=true,facing=down]
Block coordinates: World: (0,2,-29), Chunk: (at 0,0,3 in 0,-2; contains blocks 0,0,-32 to 15,255,-17), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Stacktrace:
at bqy.b(SourceFile:162)
at bqu.a(SourceFile:100)
at bqt.b(SourceFile:140)
at boh.a(SourceFile:913)
at bnz.a(SourceFile:1237)
at bnz.b(SourceFile:1171)

– Affected level –
Details:
Level name: MpServer
All players: 16 total; [bnn['kmokev'/1135, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['bossatronio24'/1055, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['killerduc'/289, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['SaltyAustin'/321, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['King_Linko'/66, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['IamTheHawK'/323, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['clubem'/70, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['_BabyG'/839, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['XxXxsniperxXxX'/73, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['Chxrge'/332, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['happynice12525'/1116, l='MpServer', x=0.28, y=2.00, z=-22.31], bno['HTC_Android_21'/104, l='MpServer', x=0.50, y=20.00, z=-25.50], bno['MojoHacks'/147, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['Zooo05'/148, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['WormBro11'/924, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['ybathegba'/1136, l='MpServer', x=0.00, y=20.00, z=-26.00]]
Chunk stats: MultiplayerChunkCache: 81, 81
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (0,20,-26), Chunk: (at 0,1,6 in 0,-2; contains blocks 0,0,-32 to 15,255,-17), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 170313671 game time, 170313671 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: 33 total; [bnn['kmokev'/1135, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['bossatronio24'/1055, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['SaltyAustin'/321, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['killerduc'/289, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['King_Linko'/66, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['IamTheHawK'/323, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['SaltyAustin'/321, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['King_Linko'/66, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['clubem'/70, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['IamTheHawK'/323, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['_BabyG'/839, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['clubem'/70, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['_BabyG'/839, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['XxXxsniperxXxX'/73, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['XxXxsniperxXxX'/73, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['Chxrge'/332, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['Chxrge'/332, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['happynice12525'/1116, l='MpServer', x=0.28, y=2.00, z=-22.31], bno['HTC_Android_21'/104, l='MpServer', x=0.50, y=20.00, z=-25.50], bno['MojoHacks'/147, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['Zooo05'/148, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['WormBro11'/924, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['ybathegba'/1136, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['MojoHacks'/147, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['Zooo05'/148, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['happynice12525'/1116, l='MpServer', x=0.28, y=2.00, z=-22.31], bno['WormBro11'/924, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['bossatronio24'/1055, l='MpServer', x=0.00, y=20.00, z=-26.00], bno['killerduc'/289, l='MpServer', x=0.00, y=20.00, z=-26.00], xx['Welcome to §3§lPrime§b§lMC§f!'/36, l='MpServer', x=0.59, y=19.32, z=-21.63], xx['Choose a server to play on!'/37, l='MpServer', x=0.59, y=19.07, z=-21.63], bno['HTC_Android_21'/104, l='MpServer', x=0.50, y=20.00, z=-25.50], bno['ybathegba'/1136, l='MpServer', x=0.00, y=20.00, z=-26.00]]
Retry entities: 0 total; []
Server brand: PaperSpigot
Server type: Non-integrated multiplayer server
Stacktrace:
at bln.a(SourceFile:364)
at bcx.b(SourceFile:2535)
at bcx.a(SourceFile:405)
at net.minecraft.client.main.Main.main(SourceFile:124)

– 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: 102875480 bytes (98 MB) / 239697920 bytes (228 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: Intel(R) HD Graphics 5500 GL version 4.4.0 - Build 10.18.15.4281, Intel
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: FaithfulVenom-32x-1.9-r4.zip
Current Language: ~_ERROR~ NullPointerException: null
Profiler Position: N/A (disabled)
CPU: 4x Intel(R) Core(TM) i3-5020U CPU @ 2.20GHz

This is a duplicate of MC-103978.
The issue is caused by a modded server. Please do not create issues unless you are able to reproduce this on a 100% vanilla environment (Both client and server unmodded).