Bukkit

[13:02:14] [Server thread/INFO]: player issued server command: /ctags player player '
[13:02:14] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'ctags' in plugin ColoredTags v2.1.3
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[patched_1.10.2.jar:git-Paper-838]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:151) ~[patched_1.10.2.jar:git-Paper-838]
	at org.bukkit.craftbukkit.v1_10_R1.CraftServer.dispatchCommand(CraftServer.java:665) ~[patched_1.10.2.jar:git-Paper-838]
	at net.minecraft.server.v1_10_R1.PlayerConnection.handleCommand(PlayerConnection.java:1389) [patched_1.10.2.jar:git-Paper-838]
	at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:1194) [patched_1.10.2.jar:git-Paper-838]
	at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [patched_1.10.2.jar:git-Paper-838]
	at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(PacketPlayInChat.java:5) [patched_1.10.2.jar:git-Paper-838]
	at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13) [patched_1.10.2.jar:git-Paper-838]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_102]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_102]
	at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45) [patched_1.10.2.jar:git-Paper-838]
	at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:791) [patched_1.10.2.jar:git-Paper-838]
	at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:404) [patched_1.10.2.jar:git-Paper-838]
	at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:725) [patched_1.10.2.jar:git-Paper-838]
	at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:624) [patched_1.10.2.jar:git-Paper-838]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_102]
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
	at java.lang.String.substring(String.java:1967) ~[?:1.8.0_102]
	at com.gmail.filoghost.coloredtags.Utils.joinArgsWithBrackets(Utils.java:32) ~[?:?]
	at com.gmail.filoghost.coloredtags.CommandHandler.onCommand(CommandHandler.java:119) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[patched_1.10.2.jar:git-Paper-838]
	... 15 more