Don't apply fall damage when cancelled. Fixes BUKKIT-4065

src/main/java/net/minecraft/server/EntityLiving.java

@@ -957,13 +957,15 @@ public abstract class EntityLiving extends Entity {
         // CraftBukkit start
         if (i > 0) {
             EntityDamageEvent event = CraftEventFactory.callEntityDamageEvent(null, this, EntityDamageEvent.DamageCause.FALL, i);
-            if (!event.isCancelled()) {
+            if (event.isCancelled()) {
+                return;
+            }
+
             i = event.getDamage();
             if (i > 0) {
                 this.getBukkitEntity().setLastDamageCause(event);
             }
         }
-        }
         // CraftBukkit end
 
         if (i > 0) {