Add null check at isEmergencyNumber().

     * listed in the ril / sim, then return true, otherwise false.

     */

    public static boolean isEmergencyNumber(String number) {

        // If the number passed in is null, just return false:

        if (number == null) return false;

        // Strip the separators from the number before comparing it

        // to the list.

        number = extractNetworkPortion(number);