Paper/paper-server/patches/sources/net/minecraft/server/commands/LootCommand.java.patch

--- a/net/minecraft/server/commands/LootCommand.java
+++ b/net/minecraft/server/commands/LootCommand.java
@@ -395,6 +_,7 @@
 
     private static int dropInWorld(CommandSourceStack source, Vec3 pos, List<ItemStack> items, LootCommand.Callback callback) throws CommandSyntaxException {
         ServerLevel level = source.getLevel();
+        items.removeIf(ItemStack::isEmpty); // CraftBukkit - SPIGOT-6959 Remove empty items for avoid throw an error in new EntityItem
         items.forEach(itemStack -> {
             ItemEntity itemEntity = new ItemEntity(level, pos.x, pos.y, pos.z, itemStack.copy());
             itemEntity.setDefaultPickUpDelay();