 
         private function _updateMovieFrame(passedTime:Number):void {
             if (!_movieInfoList) { return; }
-            if (_movieInfoList.length == 0) { return; }
+            if (_movieInfoList.length <= 1) { return; }
 
             var nextDuration:Number = _movieInfoList[_frameCount][1];
             _framePlayTime += passedTime;

            _movieImage = getImage(imageName);
            addImage(_movieImage, width, height, x, y);
            _frameCount = 0;
        }

        public function setRandomFrame():void {

         * Please call after init().
         *
         * @param infoList List of [imageName, durationSec]. Example:
         * <pre>
         * [
         *     ['frame_1', 0.1],
         *     ['frame_2', 0.1],
         *     ['frame_3', 0.1],
         *     ...
         * ]
         * </pre>
         */
        public function setUpMovieClip(infoList:Array, width:Number, height:Number,
                                       x:Number=0, y:Number=0):void
        {
            _movieInfoList = infoList;
