From 98467daafc3c829fb77aa7b95d3eeb908cd43e4e Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 21 Mar 2018 20:52:07 -0400
Subject: [PATCH] Fix Dragon Server Crashes

If the dragon tries to find "ground" and hits a hole, or off edge,
it will infinitely keep looking for non air and eventually crash.

diff --git a/src/main/java/net/minecraft/server/DragonControllerLandedFlame.java b/src/main/java/net/minecraft/server/DragonControllerLandedFlame.java
index c42de9771..40a8beff5 100644
--- a/src/main/java/net/minecraft/server/DragonControllerLandedFlame.java
+++ b/src/main/java/net/minecraft/server/DragonControllerLandedFlame.java
@@ -54,7 +54,7 @@ public class DragonControllerLandedFlame extends AbstractDragonControllerLanded
             double d3 = d2;
             BlockPosition.MutableBlockPosition blockposition_mutableblockposition = new BlockPosition.MutableBlockPosition(d0, d2, d1);
 
-            while (this.a.world.isEmpty(blockposition_mutableblockposition)) {
+            while (this.a.world.isEmpty(blockposition_mutableblockposition ) && d2 > 0) { // Paper
                 --d3;
                 if (d3 < 0.0D) {
                     d3 = d2;
-- 
2.17.1