[18:59:24 FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.IndexOutOfBoundsException: Index: 49, Size: 45
        at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_281]
        at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_281]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:45) [server.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [server.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [server.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [server.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [server.jar:git-Spigot-21fe707-e1ebe52]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_281]
Caused by: java.lang.IndexOutOfBoundsException: Index: 49, Size: 45
        at java.util.ArrayList.rangeCheck(Unknown Source) ~[?:1.8.0_281]
        at java.util.ArrayList.get(Unknown Source) ~[?:1.8.0_281]
        at net.minecraft.server.v1_8_R3.Container.clickItem(Container.java:268) ~[server.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1635) ~[server.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:31) ~[server.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:9) ~[server.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) ~[server.jar:git-Spigot-21fe707-e1ebe52]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_281]
        at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_281]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) ~[server.jar:git-Spigot-21fe707-e1ebe52]
        ... 5 more