抓取数据常见出错。

网络好的时候一切正常，连续跑个几天都没问题。

网速不快的时候会出现下面的错误并停止。应该是内部错误，有没有得解？

Traceback (most recent call last):
File "C:\Program Files (x86)\ShadowBot\shadowbot-5.2.29\python\lib\runpy.py", line 193, in _run_module_as_main
"__main__", mod_spec)
File "C:\Program Files (x86)\ShadowBot\shadowbot-5.2.29\python\lib\runpy.py", line 85, in _run_code
exec(code, run_globals)
File "C:\Program Files (x86)\ShadowBot\shadowbot-5.2.29\python\lib\site-packages\xbot_interpreter.py", line 67, in <module>
main()
File "C:\Program Files (x86)\ShadowBot\shadowbot-5.2.29\python\lib\site-packages\xbot_interpreter.py", line 47, in main
mod.main(args)
File "C:\Users\exocell\AppData\Local\ShadowBot\users\ca005074-85c1-4ea0-8b3a-ad89da93ad76\apps\668ac2cf-3bcb-46a5-8125-9f23857fe7fe\xbot_robot\main.py", line 126, in main
if xbot_visual.web.browser.contains_element_or_text(browser=web_page, content_type="contains_element", selector=package.selector("svg_chevron-icon"), text="", _block=("main", 66, "IF 网页包含")):
File "<string>", line 79, in wrapper
File "<string>", line 74, in wrapper
File "<string>", line 257, in contains_element_or_text
File "<string>", line 306, in _browser
File "<string>", line 27, in valid
ValueError: 网页对象参数不能为None