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java.lang.NullPointerException: 	at java.util.TreeMap.getEntry(Unknown Source)	at java.util.TreeMap.get(Unknown Source)	at com.forgeessentials.economy.commands.CommandSellprice.calcPriceList(	at com.forgeessentials.economy.commands.CommandSellprice.parse(	at com.forgeessentials.core.commands.ParserCommandBase.func_71515_b(	at net.minecraft.command.CommandHandler.func_71556_a(	at	at	at	at	at	at	at net.minecraft.server.MinecraftServer.func_71190_q(	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(	at net.minecraft.server.MinecraftServer.func_71217_p(	at	at net.minecraft.server.MinecraftServer$