---- Minecraft Crash Report ---- // Shall we play a game? Time: 12/13/16 4:22 PM Description: Exception ticking world java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.remove(HashMap.java:1443) at lv.d(SourceFile:198) at lw.d(SourceFile:201) at net.minecraft.server.MinecraftServer.D(SourceFile:626) at net.minecraft.server.MinecraftServer.C(SourceFile:562) at cce.C(SourceFile:154) at net.minecraft.server.MinecraftServer.run(SourceFile:466) at java.lang.Thread.run(Thread.java:745) A detailed walkthrough of the error, its code path and all known details is as follows: --------------------------------------------------------------------------------------- -- Head -- Thread: Server thread Stacktrace: at java.util.HashMap$HashIterator.remove(HashMap.java:1443) at lv.d(SourceFile:198) at lw.d(SourceFile:201) -- Affected level -- Details: Level name: Some All players: 0 total; [] Chunk stats: ServerChunkCache: 621 Drop: 333 Level seed: 2555308349489401273 Level generator: ID 00 - default, ver 1. Features enabled: true Level generator options: Level spawn location: World: (-248,64,-88), Chunk: (at 8,4,8 in -16,-6; contains blocks -256,0,-96 to -241,255,-81), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1) Level time: 259125 game time, 5328 day time Level dimension: 0 Level storage version: 0x04ABD - Anvil Level weather: Rain time: 30604 (now: false), thunder time: 5099 (now: false) Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false Stacktrace: at net.minecraft.server.MinecraftServer.D(SourceFile:626) at net.minecraft.server.MinecraftServer.C(SourceFile:562) at cce.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 Operating System: Mac OS X (x86_64) version 10.11.6 Java Version: 1.8.0_74, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 88831256 bytes (84 MB) / 284049408 bytes (270 MB) up to 1060372480 bytes (1011 MB) JVM Flags: 5 total; -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94 Profiler Position: N/A (disabled) Player Count: 0 / 8; [] Type: Integrated Server (map_client.txt) Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.