insertWithOnConflict making Columns null

I have the following code to update or insert database, where q_id is my primary key

public long updateResponse(int response, int q_id) {
        SQLiteDatabase db = helper.getWritableDatabase();

        ContentValues contentValues = new ContentValues();
        long id = 0;



        contentValues.put(VivzHelper.Q_ID, q_id);
        contentValues.put(VivzHelper.QUESTION_RESPONSE, response);
        id =  db.insertWithOnConflict(VivzHelper.TABLE_QUESTION_TEXT, null, contentValues, SQLiteDatabase.CONFLICT_REPLACE);
        if(id==-1)
        Log.d("failed", "failed"+response);
        else
        Log.d("success","success"+response);
        return id;
    }

Above code is updating/inserting QUESTION_RESPONSE but making all other column in that row as null in table.. Help