SPIGOT-5058: ClassCastException when getting InventoryHolder of lectern when it's destroyed

nms-patches/TileEntityLectern.patch

@@ -58,7 +58,7 @@
 +
 +        @Override
 +        public InventoryHolder getOwner() {
-+            return (Lectern) CraftBlock.at(world, position).getState();
++            return (Lectern) TileEntityLectern.this.getOwner();
 +        }
 +        // CraftBukkit end