Paper/nms-patches/PacketPlayOutMultiBlockChange.patch

--- a/net/minecraft/server/PacketPlayOutMultiBlockChange.java
+++ b/net/minecraft/server/PacketPlayOutMultiBlockChange.java
@@ -24,7 +24,7 @@
             short short0 = (Short) shortiterator.next();
 
             this.b[i] = short0;
-            this.c[i] = chunksection.getType(SectionPosition.a(short0), SectionPosition.b(short0), SectionPosition.c(short0));
+            this.c[i] = (chunksection != null) ? chunksection.getType(SectionPosition.a(short0), SectionPosition.b(short0), SectionPosition.c(short0)) : Blocks.AIR.getBlockData(); // CraftBukkit - SPIGOT-6076, Mojang bug when empty chunk section notified
         }
 
     }