[23:21:20 ERROR]: Could not pass event InventoryClickEvent to UltraMinions v2.6.0
org.bukkit.event.EventException: null
        at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:72) ~[spigot.jar:git-Paper-"5d8b3d49"]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[spigot.jar:git-Paper-"5d8b3d49"]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Paper-"5d8b3d49"]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:527) ~[spigot.jar:git-Paper-"5d8b3d49"]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:512) ~[spigot.jar:git-Paper-"5d8b3d49"]
        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1983) ~[spigot.jar:git-Paper-"5d8b3d49"]
        at net.minecraft.server.v1_12_R1.PacketPlayInWindowClick.a(SourceFile:33) ~[spigot.jar:git-Paper-"5d8b3d49"]
        at net.minecraft.server.v1_12_R1.PacketPlayInWindowClick.a(SourceFile:10) ~[spigot.jar:git-Paper-"5d8b3d49"]
        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:14) ~[spigot.jar:git-Paper-"5d8b3d49"]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_241]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_241]
        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [spigot.jar:git-Paper-"5d8b3d49"]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:849) [spigot.jar:git-Paper-"5d8b3d49"]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:427) [spigot.jar:git-Paper-"5d8b3d49"]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:773) [spigot.jar:git-Paper-"5d8b3d49"]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:665) [spigot.jar:git-Paper-"5d8b3d49"]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_241]
Caused by: java.lang.NullPointerException
        at io.github.Leonardo0013YT.UltraMinions.menus.MinionMenu.createPreviewCraftMenu(MinionMenu.java:154) ~[?:?]
        at io.github.Leonardo0013YT.UltraMinions.listeners.MenuListener.onMenu(MenuListener.java:182) ~[?:?]
        at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor585.execute(Unknown Source) ~[?:?]
        at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:70) ~[spigot.jar:git-Paper-"5d8b3d49"]
        ... 16 more