---- Minecraft Crash Report ----
// I just don't know what went wrong :(
 
Time: 5/12/19 10:59 PM
Description: Ticking block entity
 
java.util.ConcurrentModificationException
    at java.util.HashMap$HashIterator.nextNode(HashMap.java:1442)
    at java.util.HashMap$KeyIterator.next(HashMap.java:1466)
    at vg.a(SourceFile:1031)
    at bhi.a(SourceFile:234)
    at bvg.U_(SourceFile:338)
    at bhi.K(SourceFile:625)
    at vg.a(SourceFile:402)
    at net.minecraft.server.MinecraftServer.b(SourceFile:827)
    at ug.b(SourceFile:343)
    at net.minecraft.server.MinecraftServer.a(SourceFile:764)
    at net.minecraft.server.MinecraftServer.run(SourceFile:632)
    at java.lang.Thread.run(Thread.java:748)
 
 
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
 
-- Head --
Thread: Server thread
Stacktrace:
    at java.util.HashMap$HashIterator.nextNode(HashMap.java:1442)
    at java.util.HashMap$KeyIterator.next(HashMap.java:1466)
    at vg.a(SourceFile:1031)
    at bhi.a(SourceFile:234)
    at bvg.U_(SourceFile:338)
 
-- Block entity being ticked --
Details:
    Name: minecraft:piston // bvg
    Block: Block{minecraft:black_concrete}
    Block location: World: (3912,43,-18362), Chunk: (at 8,2,6 in 244,-1148; contains blocks 3904,0,-18368 to 3919,255,-18353), Region: (7,-36; contains chunks 224,-1152 to 255,-1121, blocks 3584,0,-18432 to 4095,255,-17921)
    Block: Block{minecraft:black_concrete}
    Block location: World: (3912,43,-18362), Chunk: (at 8,2,6 in 244,-1148; contains blocks 3904,0,-18368 to 3919,255,-18353), Region: (7,-36; contains chunks 224,-1152 to 255,-1121, blocks 3584,0,-18432 to 4095,255,-17921)
Stacktrace:
    at bhi.K(SourceFile:625)
    at vg.a(SourceFile:402)
 
-- Affected level --
Details:
    Level name: world
    All players: 7 total; [vh['Ciecia'/3701, l='world', x=-2907.95, y=65.00, z=-10711.89], vh['Dubai_'/724, l='world', x=-21951.41, y=45.94, z=18892.57], vh['XxAussieLagxX'/232968, l='world', x=18923.59, y=66.00, z=2246.43], vh['LordOfTheAngels'/290660, l='world', x=6544.30, y=18.00, z=-670.34], vh['Ben_1447'/335767, l='world', x=-148.66, y=23.00, z=385.69], vh['Xaito5zero'/270063, l='world', x=-2888.45, y=32.01, z=-10703.68], vh['CplCanuck'/230954, l='world', x=3894.94, y=99.39, z=-18440.74]]
    Chunk stats: ServerChunkCache: 13486
    Level seed: -7642458828358541746
    Level generator: ID 00 - default, ver 1. Features enabled: true
    Level generator options: {}
    Level spawn location: World: (0,85,0), Chunk: (at 0,5,0 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: 46083816 game time, 9293560 day time
    Level dimension: 0
    Level storage version: 0x04ABD - Anvil
    Level weather: Rain time: 8450 (now: false), thunder time: 12250 (now: false)
    Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
    at net.minecraft.server.MinecraftServer.b(SourceFile:827)
    at ug.b(SourceFile:343)
    at net.minecraft.server.MinecraftServer.a(SourceFile:764)
    at net.minecraft.server.MinecraftServer.run(SourceFile:632)
    at java.lang.Thread.run(Thread.java:748)
 
-- System Details --
Details:
    Minecraft Version: 1.14.1 Pre-Release 2
    Operating System: Linux (amd64) version 4.13.0-46-generic
    Java Version: 1.8.0_181, Oracle Corporation
    Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 1585090792 bytes (1511 MB) / 8489271296 bytes (8096 MB) up to 21474836480 bytes (20480 MB)
    JVM Flags: 3 total; -Xmx20480M -Xms8096M -XX:+UseG1GC
    Player Count: 7 / 25; [vh['Ciecia'/3701, l='world', x=-2907.95, y=65.00, z=-10711.89], vh['Dubai_'/724, l='world', x=-21951.41, y=45.94, z=18892.57], vh['XxAussieLagxX'/232968, l='world', x=18923.59, y=66.00, z=2246.43], vh['LordOfTheAngels'/290660, l='world', x=6544.30, y=18.00, z=-670.34], vh['Ben_1447'/335767, l='world', x=-148.66, y=23.00, z=385.69], vh['Xaito5zero'/270063, l='world', x=-2888.45, y=32.01, z=-10703.68], vh['CplCanuck'/230954, l='world', x=3894.94, y=99.39, z=-18440.74]]
    Data Packs: vanilla
    Is Modded: Unknown (can't tell)
    Type: Dedicated Server (map_server.txt)