[Server thread/ERROR]: Could not pass event InventoryCloseEvent to LecturnClassCast v1.0-SNAPSHOT
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:320) ~[spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:520) ~[spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:505) ~[spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at org.bukkit.craftbukkit.v1_14_R1.event.CraftEventFactory.handleInventoryCloseEvent(CraftEventFactory.java:1213) ~[spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at net.minecraft.server.v1_14_R1.EntityPlayer.closeInventory(EntityPlayer.java:1148) ~[spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at net.minecraft.server.v1_14_R1.EntityPlayer.tick(EntityPlayer.java:354) ~[spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at net.minecraft.server.v1_14_R1.WorldServer.entityJoinedWorld(WorldServer.java:570) ~[spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at net.minecraft.server.v1_14_R1.WorldServer$$Lambda$2412.00000000151D36F0.accept(Unknown Source) ~[?:?]
        at net.minecraft.server.v1_14_R1.World.a(World.java:745) [spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at net.minecraft.server.v1_14_R1.WorldServer.doTick(WorldServer.java:346) [spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at net.minecraft.server.v1_14_R1.MinecraftServer.b(MinecraftServer.java:1057) [spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at net.minecraft.server.v1_14_R1.DedicatedServer.b(DedicatedServer.java:396) [spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:956) [spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:801) [spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at java.lang.Thread.run(Thread.java:813) [?:1.8.0_202]
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_14_R1.block.CraftBlockState incompatible with org.bukkit.block.Lectern
        at net.minecraft.server.v1_14_R1.TileEntityLectern$LecternInventory.getOwner(TileEntityLectern.java:57) ~[spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at org.bukkit.craftbukkit.v1_14_R1.inventory.CraftInventoryLectern.getHolder(CraftInventoryLectern.java:15) ~[spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at org.bukkit.craftbukkit.v1_14_R1.inventory.CraftInventoryLectern.getHolder(CraftInventoryLectern.java:1) ~[spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        at io.github.rypofalem.lecturn_class_cast.LecturnClassCastPlugin.onInventoryClose(LecturnClassCastPlugin.java:20) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_202]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_202]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_202]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_202]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:316) ~[spigot-1.14.2.jar:git-Spigot-df0eb25-411609d]
        ... 15 more

public class LecturnClassCastPlugin extends JavaPlugin implements Listener {
    public void onEnable(){
        Bukkit.getPluginManager().registerEvents(this,this);
    }

    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled=true)
    public void onInventoryClose(InventoryCloseEvent event){
        event.getInventory().getHolder();
    }
}