This crash log came up after trading with villager and waiting for him to "regenerate himself".

---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 14/08/16 18:56
Description: Ticking entity

java.lang.ArrayIndexOutOfBoundsException: 1
at aaf.dp(SourceFile:534)
at aaf.M(SourceFile:220)
at so.cr(SourceFile:650)
at sn.n(SourceFile:1793)
at so.n(SourceFile:495)
at sb.n(SourceFile:136)
at sn.m(SourceFile:1655)
at so.m(SourceFile:278)
at aiu.a(SourceFile:1526)
at lu.a(SourceFile:716)
at aiu.g(SourceFile:1504)
at aiu.k(SourceFile:1387)
at lu.k(SourceFile:549)
at net.minecraft.server.MinecraftServer.D(SourceFile:627)
at net.minecraft.server.MinecraftServer.C(SourceFile:555)
at caj.C(SourceFile:154)
at net.minecraft.server.MinecraftServer.run(SourceFile:459)
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 aaf.dp(SourceFile:534)
at aaf.M(SourceFile:220)
at so.cr(SourceFile:650)
at sn.n(SourceFile:1793)
at so.n(SourceFile:495)
at sb.n(SourceFile:136)
at sn.m(SourceFile:1655)
at so.m(SourceFile:278)
at aiu.a(SourceFile:1526)
at lu.a(SourceFile:716)
at aiu.g(SourceFile:1504)

– Entity being ticked –
Details:
Entity Type: minecraft:villager (aaf)
Entity ID: 7095
Entity Name: Villager
Entity's Exact location: -379.81, 69.00, 95.48
Entity's Block location: World: (-380,69,95), Chunk: (at 4,4,15 in -24,5; contains blocks -384,0,80 to -369,255,95), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Entity's Momentum: 0.00, -0.08, 0.00
Entity's Passengers: []
Entity's Vehicle: ~_ERROR~ NullPointerException: null
Stacktrace:
at aiu.k(SourceFile:1387)
at lu.k(SourceFile:549)

– Affected level –
Details:
Level name: New World
All players: 1 total; [lw['IconByte'/679, l='New World', x=-378.12, y=69.00, z=97.00]]
Chunk stats: ServerChunkCache: 838 Drop: 0
Level seed: -8544914520168451923
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (-130,64,257), Chunk: (at 14,4,1 in -9,16; contains blocks -144,0,256 to -129,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 5886 game time, 5886 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 93792 (now: false), thunder time: 44327 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.D(SourceFile:627)
at net.minecraft.server.MinecraftServer.C(SourceFile:555)
at caj.C(SourceFile:154)
at net.minecraft.server.MinecraftServer.run(SourceFile:459)
at java.lang.Thread.run(Thread.java:745)

– System Details –
Details:
Minecraft Version: 16w32b
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: 101164344 bytes (96 MB) / 471220224 bytes (449 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: 12, tallocated: 94
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [lw['IconByte'/679, l='New World', x=-378.12, y=69.00, z=97.00]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.