[19:04:22] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.ArrayIndexOutOfBoundsException
    at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_191]
    at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_191]
    at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:47) [spigot-1.12.2.jar:git-Spigot-642f6d2-6103339]
    at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:748) [spigot-1.12.2.jar:git-Spigot-642f6d2-6103339]
    at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [spigot-1.12.2.jar:git-Spigot-642f6d2-6103339]
    at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [spigot-1.12.2.jar:git-Spigot-642f6d2-6103339]
    at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [spigot-1.12.2.jar:git-Spigot-642f6d2-6103339]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_191]
Caused by: java.lang.ArrayIndexOutOfBoundsException