Exception after calling onDestroy() method in DrinkCategoryActivity.java in Chapter 12

[ceyeep]

A NullPointerException may occur in DrinkCategoryActivity.java from Chapter 12 after calling the onDestroy() method if "cursor" or "db" objects are null (e.g., after rotating the device when having the Drink Categories list on screen).

@Override public void onDestroy() { super.onDestroy(); cursor.close(); db.close(); }

Need to do a null check on variables "cursor" and "db".