Paper/nms-patches/RecipiesShield.patch

--- a/net/minecraft/server/RecipiesShield.java
+++ b/net/minecraft/server/RecipiesShield.java
@@ -9,9 +9,13 @@
         craftingmanager.a(new RecipiesShield.Decoration(null));
     }
 
-    static class Decoration implements IRecipe {
+    static class Decoration extends ShapelessRecipes implements IRecipe { // CraftBukkit - added extends
 
-        private Decoration() {}
+        // CraftBukkit start - Delegate to new parent class with bogus info
+        private Decoration() {
+            super(new ItemStack(Items.SHIELD, 0 ,0), java.util.Arrays.asList(new ItemStack(Items.BANNER, 0, 0)));
+        }
+        // CraftBukkit end
 
         public boolean a(InventoryCrafting inventorycrafting, World world) {
             ItemStack itemstack = ItemStack.a;