Problem/Bug When I write the /tempmute command in the CustomBan plugin, I get the following error

[КОД] org.bukkit.command.CommandException: необработанное исключение при выполнении команды tempmute в плагине CustomBans v1.4
в org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[PaperSpigot.jar:git-Paper-1618]
на org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:152) ~[PaperSpigot.jar:git-Paper-1618]
на org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:685) ~[PaperSpigot.jar:git-Paper-1618]
в net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1492) ~[?:git-Paper-1618]
на net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1297) ~[?:git-Paper-1618]
в net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) ~[PaperSpigot.jar:git-Paper-1618]
в net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[PaperSpigot.jar:git-Paper-1618]
at net.minecraft.server.v1_12_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:14) ~[PaperSpigot.jar:git-Paper-1618]
в java.util.concurrent.Executors$RunnableAdapter.call(неизвестный источник) ~[?:1.8.0_333]
в java.util.concurrent.FutureTask.run (неизвестный источник) ~[?:1.8.0_333]
в net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) ~[PaperSpigot.jar:git-Paper-1618]
в net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:850) ~[PaperSpigot.jar:git-Paper-1618]
at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:423) ~[PaperSpigot.jar:git-Paper-1618]
в net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:774) ~[PaperSpigot.jar:git-Paper-1618]
на net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:666) ~[PaperSpigot.jar:git-Paper-1618]
на java.lang.Thread.run (неизвестный источник) [?: 1.8.0_333]
Вызвано: java.lang.NumberFormatException: null
at java.lang.Long.parseLong(Unknown Source) ~[?:1.8.0_333]
at java.lang.Long.parseLong(Unknown Source) ~[?:1.8.0_333]
at me.itzrex.custombans.commands.TempMuteCommand.onCommand(TempMuteCommand.java:61) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[PaperSpigot.jar:git-Paper-1618]
... 15 more[/CODE]

 

so it has to do something with a number format.
like if you type a command and an argument like /give DopeBrot apple
"/give" is the command and "DopeBrot" is argument 0 and "apple" argument 1
so if one argument needs an number like (1-9) but i gets a text ("Cookiemonster1337") you'll get an error