[Python] Missing text attribute "python language, chatterbot library"

I'm working on a mathematic chatbot, and I have this python code:

#this is the code that I wrote

from chatterbot import ChatBot


bot = ChatBot('Math', logic_adapters=[{'import_path':'chatterbot.logic.MathematicalEvaluation'}])


while True:
user_in = input()
print("chatbot: ", bot.get_response(user_in))


Which produces this error in the console:

AttributeError: 'NoneType' object has no attribute 'text
​

in reference to this line later in the code

text=result.text


here is full code:

class ResultOption:
def __init__(self, statement, count=1):
self.statement = statement
self.count = count


# If multiple adapters agree on the same statement,
# then that statement is more likely to be the correct response
if len(results) >= 3:
result_options = {}

for result_option in results:
result_string = result_option.text + ':' + (result_option.in_response_to or '')

if result_string in result_options:
result_options[result_string].count += 1
if result_options[result_string].statement.confidence < result_option.confidence:
result_options[result_string].statement = result_option
else:
result_options[result_string] = ResultOption(result_option)

most_common = list(result_options.values())[0]

for result_option in result_options.values():
if result_option.count > most_common.count:
most_common = result_option

if most_common.count > 1:
result = most_common.statement

# Always the console says this
response = Statement(
# error is here !!
text=result.text,
in_response_to=input_statement.text,
conversation=input_statement.conversation,
persona='bot:' + self.name
)

response.confidence = result.confidence

return response


How can I fix this?

Continue reading...