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[19:05:09 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'ds' in plugin DeathSwap v1.0
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[server.jar:git-Bukkit-e60fc34]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) ~[server.jar:git-Bukkit-e60fc34]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:628) ~[server.jar:git-Bukkit-e60
fc34]
        at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1340) [server.jar:git-Bukk
it-e60fc34]
        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1200) [server.jar:git-Bukkit-e60fc34]
        at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(SourceFile:37) [server.jar:git-Bukkit-e60fc34]
        at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(SourceFile:9) [server.jar:git-Bukkit-e60fc34]
        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [server.jar:git-Bukkit-e60fc34]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_221]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_221]
        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [server.jar:git-Bukkit-e60fc34]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:696) [server.jar:git-Bukkit-e60fc34]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:371) [server.jar:git-Bukkit-e60fc34]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:651) [server.jar:git-Bukkit-e60fc34]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:555) [server.jar:git-Bukkit-e60fc34]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_221]
Caused by: java.lang.NullPointerException
        at de.cxl.commands.SetTeam.SetTeamCore.onCommand(SetTeamCore.java:33) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[server.jar:git-Bukkit-e60fc34]
        ... 15 more
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