Trying to clone an Object3D causes a NullPointerException. The object on which cloneObject() is called is definitely not null itself (see stacktrace below).
The strange thing is, the very same object is beeing cloned multiple times at an earlier stage of the game without any problems. Am I missing something, wich causes this behavior?
Device:
Samsung Galaxy TabPRO 10 (SM-T520)
Android 4.4.2 (KitKat)
05-29 01:33:46.491: E/AndroidRuntime(14875): FATAL EXCEPTION: GLThread 61362
05-29 01:33:46.491: E/AndroidRuntime(14875): Process: minigame.earthdefender, PID: 14875
05-29 01:33:46.491: E/AndroidRuntime(14875): java.lang.NullPointerException
05-29 01:33:46.491: E/AndroidRuntime(14875): at com.threed.jpct.Object3D.copy(Object3D.java:723)
05-29 01:33:46.491: E/AndroidRuntime(14875): at com.threed.jpct.Object3D.<init>(Object3D.java:698)
05-29 01:33:46.491: E/AndroidRuntime(14875): at com.threed.jpct.Object3D.cloneObject(Object3D.java:2552)
05-29 01:33:46.491: E/AndroidRuntime(14875): at minigame.earthdefender.weapons.Bullet.<init>(Bullet.java:16)
05-29 01:33:46.491: E/AndroidRuntime(14875): at minigame.earthdefender.weapons.ProjectilePool.fireBullet(ProjectilePool.java:99)
05-29 01:33:46.491: E/AndroidRuntime(14875): at minigame.earthdefender.weapons.AttackQueue.dequeueAttack(AttackQueue.java:84)
05-29 01:33:46.491: E/AndroidRuntime(14875): at minigame.earthdefender.state.Running.launchProjectiles(Running.java:64)
05-29 01:33:46.491: E/AndroidRuntime(14875): at minigame.earthdefender.state.Running.onUpdate(Running.java:35)
05-29 01:33:46.491: E/AndroidRuntime(14875): at minigame.earthdefender.state.GameState.update(GameState.java:138)
05-29 01:33:46.491: E/AndroidRuntime(14875): at minigame.earthdefender.render.SmartRenderer.onDrawFrame(SmartRenderer.java:90)
05-29 01:33:46.491: E/AndroidRuntime(14875): at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1531)
05-29 01:33:46.491: E/AndroidRuntime(14875): at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1248)