null check for target

src/engine/net/client/handlers/AttackCmdMsgHandler.java

@@ -63,6 +63,10 @@ public class AttackCmdMsgHandler extends AbstractClientMsgHandler {
             return true; //cannot attack other things
         }
 
+        if(target == null) {
+            playerCharacter.setCombatTarget(target);
+            return true; // cannot attack a null target
+        }
         //set sources target
 
         playerCharacter.setCombatTarget(target);