Fix ClassCastException with Taming. Fixes #924

Changelog.txt

@@ -18,6 +18,7 @@ Version 1.4.05-dev
  = Fixed Berserk misbehaving when /reload was used
  = Fixed parties misbehaving when /reload was used
  = Fixed Berserk getting "stuck" when /mcrefresh was used
+ = Fix ClassCastException with Taming
 
 Version 1.4.04
  + Added functions to ExperienceAPI for use with offline players

src/main/java/com/gmail/nossr50/listeners/EntityListener.java

@@ -1,5 +1,6 @@
 package com.gmail.nossr50.listeners;
 
+import org.bukkit.OfflinePlayer;
 import org.bukkit.block.Block;
 import org.bukkit.entity.AnimalTamer;
 import org.bukkit.entity.Entity;
@@ -106,7 +107,7 @@ public class EntityListener implements Listener {
         else if (attacker instanceof Tameable) {
             AnimalTamer animalTamer = ((Tameable) attacker).getOwner();
 
-            if (animalTamer != null) {
+            if (animalTamer != null && ((OfflinePlayer) animalTamer).isOnline()) {
                 attacker = (Entity) animalTamer;
             }
         }