Flask handling multiple errors

@appFlask.route('sum', methods=['POST'])
def result():
    try:
       data = request.get_json()
       # check if a or b is not 0
       if data['a'] == 0 or data['b'] == 0:
           raise Exception("Error occurred")
       return jsonify({'sum': data['a'] + data['b']})
    except Exception as e:
       return "400 Bad Request"