Issue title: Error on /premium and /cracked
 Issue body: `[21:55:26] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'cracked' in plugin FastLogin v1.9
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Spigot-d276ab1-d219213]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot.jar:git-Spigot-d276ab1-d219213]
	at org.bukkit.craftbukkit.v1_11_R1.CraftServer.dispatchCommand(CraftServer.java:650) ~[spigot.jar:git-Spigot-d276ab1-d219213]
	at net.minecraft.server.v1_11_R1.PlayerConnection.handleCommand(PlayerConnection.java:1353) [spigot.jar:git-Spigot-d276ab1-d219213]
	at net.minecraft.server.v1_11_R1.PlayerConnection.a(PlayerConnection.java:1188) [spigot.jar:git-Spigot-d276ab1-d219213]
	at net.minecraft.server.v1_11_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot.jar:git-Spigot-d276ab1-d219213]
	at net.minecraft.server.v1_11_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot.jar:git-Spigot-d276ab1-d219213]
	at net.minecraft.server.v1_11_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot.jar:git-Spigot-d276ab1-d219213]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_91]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_91]
	at net.minecraft.server.v1_11_R1.SystemUtils.a(SourceFile:46) [spigot.jar:git-Spigot-d276ab1-d219213]
	at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:747) [spigot.jar:git-Spigot-d276ab1-d219213]
	at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399) [spigot.jar:git-Spigot-d276ab1-d219213]
	at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:678) [spigot.jar:git-Spigot-d276ab1-d219213]
	at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:576) [spigot.jar:git-Spigot-d276ab1-d219213]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_91]
Caused by: java.lang.NullPointerException
	at com.github.games647.fastlogin.bukkit.commands.CrackedCommand.onCommand(CrackedCommand.java:38) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-d276ab1-d219213]
	... 15 more`


 Comments: 
 Comment 0: Duplicate #141
{'source': 'GithubIssues', 'repo_name_with_owner': 'games647/FastLogin', 'issue_id': 221665563, 'repo_stars': 417.0}