I tried to summon an armour stand centered on a block using this command:
/summon LeashKnot ~ ~ ~ {Passengers:[

]}

When the leash knot broke, the game crashed. I retried and it happened again. It crashes in the Nether, on void superflat and normal superflat presets.
I was on creative singleplayer and I wasn't lagging

Here's the crash report:

---- Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 09/11/16 16:10
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at sf.A(SourceFile:1316)
at sf.p(SourceFile:1873)
at rw.aw(SourceFile:1534)
at sf.aw(SourceFile:1879)
at aid.a(SourceFile:1525)
at ls.a(SourceFile:718)
at aid.g(SourceFile:1505)
at aid.a(SourceFile:1571)
at ls.a(SourceFile:718)
at aid.g(SourceFile:1505)
at aid.k(SourceFile:1388)
at ls.k(SourceFile:551)
at net.minecraft.server.MinecraftServer.D(SourceFile:626)
at net.minecraft.server.MinecraftServer.C(SourceFile:554)
at bzl.C(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:458)
at java.lang.Thread.run(Thread.java:745)

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

– Head –
Thread: Server thread
Stacktrace:
at sf.A(SourceFile:1316)
at sf.p(SourceFile:1873)
at rw.aw(SourceFile:1534)
at sf.aw(SourceFile:1879)
at aid.a(SourceFile:1525)
at ls.a(SourceFile:718)
at aid.g(SourceFile:1505)
at aid.a(SourceFile:1571)
at ls.a(SourceFile:718)
at aid.g(SourceFile:1505)

– Entity being ticked –
Details:
Entity Type: LeashKnot (ya)
Entity ID: 20373
Entity Name: entity.LeashKnot.name
Entity's Exact location: 17,50, 4,50, -2,50
Entity's Block location: World: (17,4,-3), Chunk: (at 1,0,13 in 1,-1; contains blocks 16,0,-16 to 31,255,-1), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Entity's Momentum: 0,00, 0,00, 0,00
Entity's Passengers: []
Entity's Vehicle: ~_ERROR~ NullPointerException: null
Stacktrace:
at aid.k(SourceFile:1388)
at ls.k(SourceFile:551)

– Affected level –
Details:
Level name: Elevator module
All players: 1 total; [lu['Aeldrion'/20331, l='Elevator module', x=20,79, y=4,00, z=-3,14]]
Chunk stats: ServerChunkCache: 256 Drop: 0
Level seed: -5086448452386085159
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (0,10,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 154346 game time, 182 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 1 (now: false), thunder time: 1 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.D(SourceFile:626)
at net.minecraft.server.MinecraftServer.C(SourceFile:554)
at bzl.C(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:458)
at java.lang.Thread.run(Thread.java:745)

– System Details –
Details:
Minecraft Version: 1.10.2
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 183129240 bytes (174 MB) / 285876224 bytes (272 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [lu['Aeldrion'/20331, l='Elevator module', x=20,79, y=4,00, z=-3,14]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched. -> I don't have any mods installed

Sorry for eventual grammar/spelling mistakes, I'm not a native speaker.