[17:40:28 ERROR]: Could not pass event InventoryClickEvent to MBedwars v3.1.2
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[Spigot.jar:git-PaperSpigot-"8b18730"]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[Spigot.jar:git-PaperSpigot-"8b18730"]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[Spigot.jar:git-PaperSpigot-"8b18730"]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [Spigot.jar:git-PaperSpigot-"8b18730"]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [Spigot.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1657) [Spigot.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:31) [Spigot.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:9) [Spigot.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [Spigot.jar:git-PaperSpigot-"8b18730"]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_101]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_101]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [Spigot.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:774) [Spigot.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:378) [Spigot.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:713) [Spigot.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:616) [Spigot.jar:git-PaperSpigot-"8b18730"]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_101]
Caused by: java.lang.NullPointerException
        at de.marcely.bedwars.Util.colorBlock(Util.java:402) ~[?:?]
        at de.marcely.bedwars.game.shop.Shop.buy(Shop.java:202) ~[?:?]
        at de.marcely.bedwars.game.shop.Shop.access$0(Shop.java:148) ~[?:?]
        at de.marcely.bedwars.game.shop.Shop$1.onClick(Shop.java:89) ~[?:?]
        at de.marcely.bedwars.game.shop.ShopGUIBuilder$2.onClick(ShopGUIBuilder.java:113) ~[?:?]
        at de.marcely.bedwars.event.InventoryClick.onInventoryClickEvent(InventoryClick.java:33) ~[?:?]
        at de.marcely.bedwars.event.Events.onInventoryClickEvent(Events.java:68) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor160.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_101]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_101]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[Spigot.jar:git-PaperSpigot-"8b18730"]
        ... 16 more