Ender Dragon makes breath attack at highest block placed in the center column of the portal

Confirmed for 16w14a

Confirmed for 1.9.3-pre3.

---- Minecraft Crash Report ----
// Why did you do that?

Time: 2016/5/3 下午 10:00
Description: Ticking entity

java.lang.ArrayIndexOutOfBoundsException: 1
	at ayp.f(SourceFile:71)
	at xj.k(SourceFile:68)
	at xj.j(SourceFile:63)
	at xj.c(SourceFile:24)
	at wu.n(SourceFile:238)
	at sa.m(SourceFile:1619)
	at sb.m(SourceFile:277)
	at aht.a(SourceFile:1517)
	at lq.a(SourceFile:717)
	at aht.g(SourceFile:1495)
	at aht.k(SourceFile:1385)
	at lq.k(SourceFile:550)
	at net.minecraft.server.MinecraftServer.D(SourceFile:626)
	at net.minecraft.server.MinecraftServer.C(SourceFile:554)
	at byl.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 ayp.f(SourceFile:71)
	at xj.k(SourceFile:68)
	at xj.j(SourceFile:63)
	at xj.c(SourceFile:24)
	at wu.n(SourceFile:238)
	at sa.m(SourceFile:1619)
	at sb.m(SourceFile:277)
	at aht.a(SourceFile:1517)
	at lq.a(SourceFile:717)
	at aht.g(SourceFile:1495)

-- Entity being ticked --
Details:
	Entity Type: EnderDragon (wu)
	Entity ID: 7551824
	Entity Name: 終界龍
	Entity's Exact location: -0.47, 255.98, -0.45
	Entity's Block location: World: (-1,255,-1), Chunk: (at 15,15,15 in -1,-1; contains blocks -16,0,-16 to -1,255,-1), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Entity's Momentum: 0.80, 1.48, -0.07
	Entity's Passengers: []
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at aht.k(SourceFile:1385)
	at lq.k(SourceFile:550)

-- Affected level --
Details:
	Level name: 1
	All players: 1 total; [ls['Les3awe'/7551823, l='1', x=-9.68, y=255.00, z=0.38]]
	Chunk stats: ServerChunkCache: 1089 Drop: 0
	Level seed: 7465166348844330209
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (0,0,0), 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: 0 game time, 0 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: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at net.minecraft.server.MinecraftServer.D(SourceFile:626)
	at net.minecraft.server.MinecraftServer.C(SourceFile:554)
	at byl.C(SourceFile:155)
	at net.minecraft.server.MinecraftServer.run(SourceFile:458)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 1.9.3-pre3
	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: 266373856 bytes (254 MB) / 751394816 bytes (716 MB) up to 4253024256 bytes (4056 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn400M
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [ls['Les3awe'/7551823, l='1', x=-9.68, y=255.00, z=0.38]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

Is this still an issue in the latest snapshot 16w44a? If so please update the affected versions.

This is an automated comment on any open or reopened issue with out-of-date affected versions.

Confirmed for 1.11.1

---- Minecraft Crash Report ----
// But it works on my machine.

Time: 12/21/16 12:10 AM
Description: Ticking entity

java.lang.ArrayIndexOutOfBoundsException: 1
	at bbd.f(SourceFile:74)
	at yq.k(SourceFile:68)
	at yq.j(SourceFile:63)
	at yq.c(SourceFile:24)
	at yb.n(SourceFile:246)
	at sw.A_(SourceFile:1703)
	at sx.A_(SourceFile:282)
	at ajs.a(SourceFile:1517)
	at lw.a(SourceFile:718)
	at ajs.h(SourceFile:1495)
	at ajs.k(SourceFile:1378)
	at lw.k(SourceFile:551)
	at net.minecraft.server.MinecraftServer.D(SourceFile:634)
	at net.minecraft.server.MinecraftServer.C(SourceFile:562)
	at cch.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:466)
	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 bbd.f(SourceFile:74)
	at yq.k(SourceFile:68)
	at yq.j(SourceFile:63)
	at yq.c(SourceFile:24)
	at yb.n(SourceFile:246)
	at sw.A_(SourceFile:1703)
	at sx.A_(SourceFile:282)
	at ajs.a(SourceFile:1517)
	at lw.a(SourceFile:718)
	at ajs.h(SourceFile:1495)

-- Entity being ticked --
Details:
	Entity Type: minecraft:ender_dragon (yb)
	Entity ID: 6246408
	Entity Name: Ender Dragon
	Entity's Exact location: -0.18, 256.45, 0.76
	Entity's Block location: World: (-1,256,0), Chunk: (at 15,16,0 in -1,0; contains blocks -16,0,0 to -1,255,15), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Entity's Momentum: 0.84, 0.24, -0.46
	Entity's Passengers: []
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at ajs.k(SourceFile:1378)
	at lw.k(SourceFile:551)

-- Affected level --
Details:
	Level name: New World
	All players: 1 total; [ly['ThgilFoDrol'/97112, l='New World', x=-4.30, y=257.69, z=-11.15]]
	Chunk stats: ServerChunkCache: 289 Drop: 0
	Level seed: -9072368465396243415
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (0,0,0), 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: 0 game time, 0 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: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at net.minecraft.server.MinecraftServer.D(SourceFile:634)
	at net.minecraft.server.MinecraftServer.C(SourceFile:562)
	at cch.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:466)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 1.11.1
	Operating System: Windows 8.1 (amd64) version 6.3
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 410042968 bytes (391 MB) / 656240640 bytes (625 MB) up to 1597243392 bytes (1523 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1536m -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [ly['ThgilFoDrol'/97112, l='New World', x=-4.30, y=257.69, z=-11.15]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

confirmed for 1.12

Working fix for this issue. Decompiled using MCP 9.40-Pre1 in the class net.minecraft.pathfinding (Note that this fix isnt perfect!)

public Vec3d getCurrentPos()
    {
    	System.out.println("currentPathIndex: " + this.currentPathIndex);
        //Start of the fix
    	PathPoint pathpoint = null;
    	try {
    		pathpoint = this.points[this.currentPathIndex];
    	} catch (Exception e) {
    		pathpoint = new PathPoint(0, 0, 0);		
    	}
        //end of the fix
        return new Vec3d((double)pathpoint.xCoord, (double)pathpoint.yCoord, (double)pathpoint.zCoord);
    }

Shouldn't this rather be solved without exception handling and just testing if currentPathIndex < points.length?

confirmed for 1.12.1

Confirmed for 17w50a

Confirmed for 1.13.1.

I thought this was intentional