In my developing game, sometime it show this error:

" Exception in thread "LWJGL Application" java.lang.IndexOutOfBoundsException: index can't be >= size: 1 >= 1
at com.badlogic.gdx.utils.Array.get(Array.java:127)
at com.esotericsoftware.spine.AnimationState.apply(AnimationState.java:118)"

I am trying to solve it but not success. It seem occur when game play call many to showEnemyAttackSign() function.

This is main execution code:

private IceEffectActor attackSign;
private AnimationStateAdapter listener;
private boolean attackSignFinish = true;
private int attackSignCnt = 0;

private final synchronized void showEnemyAttackSign() {
   if(attackSignCnt==0){
      attackSignFinish = false;
      attackSignCnt++;
   }
   if(attackSign !=null&&!attackSignFinish){
      attackSignFinish = true;
      attackSign.setVisible(true);
      attackSign.setAnim("ice", false);
      listener = new AnimationStateAdapter() {
         @Override
          public void event (int trackIndex, Event event) {
              // Inspect and respond to the event here.
            if (event!=null){
               if (event.getString().equalsIgnoreCase("end_ice_fx")) {
                  Gdx.app.error("BattleStage",
                        "Event finish: " + event.getString());
                  attackSign.animState.removeListener(listener);
                  listener = null;
                  attackSignCnt

---

;
                  Gdx.app.error("BattleStage attackSignCnt finish",attackSignCnt+"");
                  if(attackSignCnt==0){
                     attackSignFinish = true;
                  }
                  else{
                     attackSignCnt

---

;
                     showEnemyAttackSign();
                     attackSignFinish = false;
                  }
               }   

            }

     }
  };
  attackSign.animState.addListener(listener);
   }
   else{
      attackSignCnt++;
   }

}

This is Actor class

public class IceEffectActor extends Actor {

   public Skeleton getSkeleton() {
      return skeleton;
   }

   private Skeleton skeleton;
   private SkeletonRenderer skeletonRenderer;
   public AnimationState animState;

   public IceEffectActor() {

  setPosition(0.0f, 600.0f);
  loadAnimation();
   }

   private void loadAnimation() {
      AnimationStateData stateData = new AnimationStateData(Assets.iceFXData);

  animState = new AnimationState(stateData);
  skeleton = new Skeleton(Assets.iceFXData);
  // skeleton.setToSetupPose();
  skeleton.updateWorldTransform();

  skeletonRenderer = new SkeletonRenderer();
   }
   

   public void setAnim(String name, boolean repeat){
      animState.setAnimation(0, name, repeat);
   }

   @Override
   public void act(float delta) {

  skeleton.setX(getX() + getWidth() / 2.0f);
  skeleton.setY(getY());

  skeleton.update(delta);
  skeleton.updateWorldTransform();

  animState.update(delta);
  animState.apply(skeleton);

  super.act(delta);
   }

   @Override
   public void draw(Batch batch, float parentAlpha) {

  skeleton.getColor().a = parentAlpha;

  skeletonRenderer.draw(batch, skeleton);

  super.draw(batch, parentAlpha);

   }

}

Anyone can help me, or give a hint?

I email support, open issue on Github and post here but get nothing respond from Esotericsoftware :bang: .
@Nate can you help me?

Shiu ：

Sorry that we have not gotten back to you on this issue.

I'll make sure to poke Nate and see if he can take a look at it. I'm unfortunately not a programmer and can't help you.

Seem Nate too busy on other project, I also submit issue on Github months ago https://github.com/EsotericSoftware/spine-runtimes/issues/464