[Error with Server [java.lang.NullPointerException]]

---- Minecraft Crash Report ----
// Oops.

Time: 3/30/14 10:10 AM
Description: Exception in server tick loop

java.lang.NullPointerException
at co.uk.flansmods.common.teams.TeamsManager.tick(TeamsManager.java:136)
at co.uk.flansmods.common.CommonTickHandler.sTick(CommonTickHandler.java:32)
at co.uk.flansmods.common.CommonTickHandler.tickEnd(CommonTickHandler.java:25)
at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:34)
at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:141)
at cpw.mods.fml.common.FMLCommonHandler.onPostServerTick(FMLCommonHandler.java:274)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:813)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:659)
at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)