org.bukkit.command.CommandException: Unhandled exception executing command 'blackmarket' in plugin BlackMarket v2.0.1
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[PluginCommand.class:?]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:155) ~[SimpleCommandMap.class:?]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:752) ~[CraftServer.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147361_d(NetHandlerPlayServer.java:1587) ~[pa.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147354_a(NetHandlerPlayServer.java:1426) ~[pa.class:?]
        at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(CPacketChatMessage.java:46) ~[la.class:?]
        at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(CPacketChatMessage.java:9) ~[la.class:?]
        at net.minecraft.network.PacketThreadUtil.lambda$checkThreadAndEnqueue$0(PacketThreadUtil.java:16) ~[hv.class:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_282]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_282]
        at net.minecraft.util.Util.func_181617_a(SourceFile:46) [h.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:846) [MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:467) [nz.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:784) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:630) [MinecraftServer.class:?]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_282]
Caused by: java.lang.NullPointerException
        at com.github.plagueisthewise21.BlackMarketRevamp.Inventories.Market.getInventory(Market.java:40) ~[?:?]
        at com.github.plagueisthewise21.BlackMarketRevamp.Commands.OpenMarket.onCommand(OpenMarket.java:30) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:43) ~[PluginCommand.class:?]
        ... 15 more