DrugMeUp Start Error

02:31 PM [SEVERE] Error occurred while enabling DrugMeUp v0.9.1 (Is it up to date?)
java.lang.NullPointerException
	at me.giinger.dmu.Drugs.isMultiworld(Drugs.java:459)
	at me.giinger.dmu.Drugs.onEnable(Drugs.java:92)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:250)
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:350)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:389)
	at org.bukkit.craftbukkit.v1_7_R1.CraftServer.loadPlugin(CraftServer.java:439)
	at org.bukkit.craftbukkit.v1_7_R1.CraftServer.enablePlugins(CraftServer.java:375)
	at net.minecraft.server.v1_7_R1.MinecraftServer.m(MinecraftServer.java:342)
	at net.minecraft.server.v1_7_R1.MinecraftServer.g(MinecraftServer.java:319)
	at net.minecraft.server.v1_7_R1.MinecraftServer.a(MinecraftServer.java:275)
	at net.minecraft.server.v1_7_R1.DedicatedServer.init(DedicatedServer.java:175)
	at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:424)
	at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617)