Why doesn't this work in python vk.api?

Question

Python

if event.from_chat or event.from_user:
                if event.object.text.lower().split(' ')[0] == 'find':
                    print('начат поиск')
                    event.object.text.lower().split(' ')[1] = findingelement

"find Text" is written in the group chat, data is loaded from the file and searched in the code above by the variable findingelement.
An error is generated AttributeError: 'NoneType' object has no attribute 'lower'

In fact, I need a second text variable, please help me how to extract it from the message.