Paper/nms-patches/LootTable.patch

--- a/net/minecraft/server/LootTable.java
+++ b/net/minecraft/server/LootTable.java
@@ -39,6 +39,7 @@
     public static Consumer<ItemStack> a(Consumer<ItemStack> consumer) {
         return (itemstack) -> {
             if (itemstack.getCount() < itemstack.getMaxStackSize()) {
+                if (itemstack.isEmpty()) return; // CraftBukkit
                 consumer.accept(itemstack);
             } else {
                 int i = itemstack.getCount();