---- Minecraft Crash Report ----
// There are four lights!

Time: 19-8-6 上午10:42
Description: Ticking entity

java.lang.ClassCastException: apr cannot be cast to apo
	at avj.L(SourceFile:100)
	at aiy.dc(SourceFile:631)
	at aix.k(SourceFile:2266)
	at aiy.k(SourceFile:487)
	at aus.k(SourceFile:39)
	at axl.k(SourceFile:114)
	at aix.h(SourceFile:2111)
	at aiy.h(SourceFile:294)
	at aus.h(SourceFile:51)
	at aio.aN(SourceFile:1696)
	at aix.aN(SourceFile:2405)
	at vk.a(SourceFile:613)
	at vk.a(SourceFile:591)
	at bhr.a(SourceFile:675)
	at vk.a(SourceFile:386)
	at net.minecraft.server.MinecraftServer.b(SourceFile:835)
	at net.minecraft.server.MinecraftServer.a(SourceFile:774)
	at eac.a(SourceFile:128)
	at net.minecraft.server.MinecraftServer.run(SourceFile:642)
	at java.lang.Thread.run(Unknown Source)


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

-- Head --
Thread: Server thread
Stacktrace:
	at avj.L(SourceFile:100)
	at aiy.dc(SourceFile:631)
	at aix.k(SourceFile:2266)
	at aiy.k(SourceFile:487)
	at aus.k(SourceFile:39)
	at axl.k(SourceFile:114)
	at aix.h(SourceFile:2111)
	at aiy.h(SourceFile:294)
	at aus.h(SourceFile:51)
	at aio.aN(SourceFile:1696)
	at aix.aN(SourceFile:2405)
	at vk.a(SourceFile:613)
	at vk.a(SourceFile:591)

-- Entity being ticked --
Details:
	Entity Type: minecraft:dolphin (arf)
	Entity ID: 18412
	Entity Name: 海豚
	Entity's Exact location: 505.29, 71.25, 1043.93
	Entity's Block location: World: (505,71,1043), Chunk: (at 9,4,3 in 31,65; contains blocks 496,0,1040 to 511,255,1055), Region: (0,2; contains chunks 0,64 to 31,95, blocks 0,0,1024 to 511,255,1535)
	Entity's Momentum: 0.00, -0.08, 0.00
	Entity's Passengers: [avj['卫道士'/18414, l='新的世界0', x=505.29, y=71.25, z=1043.93]]
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at bhr.a(SourceFile:675)
	at vk.a(SourceFile:386)

-- Affected level --
Details:
	All players: 1 total; [vl['ZYX_2D'/5740, l='新的世界0', x=505.29, y=71.25, z=1043.93]]
	Chunk stats: ServerChunkCache: 3079
	Level dimension: minecraft:overworld
	Level name: 新的世界0
	Level seed: 265089783972739723
	Level generator: ID 01 - flat, ver 0. Features enabled: true
	Level generator options: {biome:"minecraft:plains",layers:[{block:"minecraft:bedrock",height:5},{block:"minecraft:emerald_block",height:55},{block:"minecraft:emerald_ore",height:9}],structures:{village:{}}}
	Level spawn location: World: (350,76,1013), Chunk: (at 14,4,5 in 21,63; contains blocks 336,0,1008 to 351,255,1023), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,0,512 to 511,255,1023)
	Level time: 9595508 game time, 6000 day time
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.b(SourceFile:835)
	at net.minecraft.server.MinecraftServer.a(SourceFile:774)
	at eac.a(SourceFile:128)
	at net.minecraft.server.MinecraftServer.run(SourceFile:642)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 1.14.4
	Minecraft Version ID: 1.14.4
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_60, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 1368960064 bytes (1305 MB) / 2449473536 bytes (2336 MB) up to 2449473536 bytes (2336 MB)
	CPUs: 4
	JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2333M -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
	Player Count: 1 / 8; [vl['ZYX_2D'/5740, l='新的世界0', x=505.29, y=71.25, z=1043.93]]
	Data Packs: vanilla
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.