Why my XMLParser do this to my database?

I am parsing my database and my application goes NPE. Now, I checked what happened in the database thru another app. This is my xmlparser method.

try {

        float scorefloat = 0;
        while (parser.next() != XmlPullParser.END_TAG) {
            if (parser.getEventType() != XmlPullParser.START_TAG) {
                continue;
            }
            String name = parser.getName();
            if (name.equals("record")) {
                String id = null, workoutName = null, muscletype = null, machine = null,
                        score=null, videopath=null;
                Workout w = new Workout(workoutName, muscletype, machine, scorefloat, videopath);
                while (parser.next() != XmlPullParser.END_TAG) {
                    if (parser.getEventType() != XmlPullParser.START_TAG) {
                        continue;
                    }
                    name = parser.getName();
                    if (name.equals("id")) {
                        id = readText(parser);

                    } else if (name.equals("workoutname")) {
                        workoutName = readText(parser);
                        w.setWorkoutName(workoutName);
                    } else if (name.equals("muscletype")) {
                        muscletype = readText(parser);
                        w.setMuscleType(muscletype);
                    } else if (name.equals("machine"))    {
                        machine = readText(parser);
                        w.setMachine(machine);
                    } else if (name.equals("score")){
                        score = readText(parser);
                        w.setScore(Float.parseFloat(score));
                    } else if (name.equals("videopath")){
                        videopath = readText(parser);
                        w.setVideoPath(videopath);  
                    }

                    myDbHelper.insertWorkout(w);
                }                                 
        }

this is the output of the database: http://ift.tt/1u5jdi5