[NODRIVER] - AttributeError: 'NoneType' object has no attribute 'aclose'

[keisunl1]

Hi everyone,

Getting this error after pushing and pulling my project onto a new computer. Using Python 3.10.9

Traceback (most recent call last):
File ****, line 1320, in
uc.loop().run_until_complete(main_script())
File ****, line 90, in run_until_complete
return f.result()
File ****, line 201, in result
raise self._exception.with_traceback(self._exception_tb)
File ****, line 232, in __step
result = coro.send(None)
File ****, line 622, in main_script
bot = await uc.start(no_sandbox=True)
File ****, line 96, in start
return await Browser.create(config)
File ****, line 91, in create
await instance.start()
File ****, line 352, in start
raise Exception(
Exception:
---------------------
Failed to connect to browser
---------------------
One of the causes could be when you are running as root.
In that case you need to pass no_sandbox=True

Exception ignored in atexit callback: <function deconstruct_browser at 0x7fa21a5ba560>
Traceback (most recent call last):
File ****, line 146, in deconstruct_browser
_.stop()
File ****, line 558, in stop
asyncio.get_event_loop().create_task(self.connection.aclose())
AttributeError: 'NoneType' object has no attribute 'aclose'

I've read some older posts and usually had found that using "pkill -9 -f "Google Chrome" had worked when I encountered this crash on my old computer, but I'm always getting this error now with no workaround on my new computer. I've also seen someone speak about a user_data_dir being corrupted but I'm not sure where to find that or fix it. Any work around for this?

[keisunl1]

Some things I've tried as I've been debugging:

• Downgrading Chrome to v129
• Tried running with asyncio.run() instead of uc.loop().run_until_complete()
• Changing websocket vers
• Adding sleep for browser initialization

The chrome instance seems to start as soon as the code crashes as well (opens up a window after catching the Exception).

[mdmintz]

That's due to a change in https://github.com/python-websockets/websockets (a dependency of NoDriver).

pip install websockets==13.1 will fix that until NoDriver is patched.

---

Or, in the meantime, you can use my patched version of Undetected Chromedriver and NoDriver in https://github.com/seleniumbase/SeleniumBase (UC Mode and CDP Mode)
Lots of updates, such as an ad-block option, proxy option, etc.

Example:

from seleniumbase import SB

with SB(uc=True, test=True, ad_block=True) as sb:
    url = "https://www.browserscan.net/bot-detection"
    sb.activate_cdp_mode(url)
    sb.cdp.flash("Test Results")
    sb.cdp.assert_element('strong:contains("Normal")')
    sb.sleep(1)
    sb.cdp.save_screenshot("b_scan.png")