selenium.common.exceptions.WebDriverException: Message: invalid session id using Selenium with ChromeDriver and Chrome through Python
invalid session id
The invalid session ID error is a WebDriver error that occurs when the server does not recognize the unique session identifier. This happens if the session has been deleted or if the session ID is invalid.
A WebDriver session can be deleted through either of the following ways:
Explicit session deletion: A WebDriver session is explicitly deleted when explicitly invoking the
quit()method as follows:Code Block:
from selenium import webdriverfrom selenium.common.exceptions import InvalidSessionIdExceptiondriver = webdriver.Chrome(executable_path=r'C:\Utility\BrowserDrivers\chromedriver.exe')print("Current session is {}".format(driver.session_id))driver.quit()try: driver.get("https://www.google.com/")except Exception as e: print(e.message)Console Output:
Current session is a9272550-c4e5-450f-883d-553d337eed48No active session with ID a9272550-c4e5-450f-883d-553d337eed48
Implicit session deletion: A WebDriver session is implicitly deleted when you close the last window or tab invoking
close()method as follows:Code Block:
driver = webdriver.Chrome(executable_path=r'C:\Utility\BrowserDrivers\chromedriver.exe')print("Current session is {}".format(driver.session_id))# closes current window/tabdriver.close()try: driver.get("https://www.google.com/")except Exception as e: print(e.message)Console Output:
Current session is a9272550-c4e5-450f-883d-553d337eed48No active session with ID a9272550-c4e5-450f-883d-553d337eed48
Conclusion
As the first one request works fine but for others you get a session ID error most possibly the WebDriver controled Web Browser is getting detected and hence blocking the next requests.
There are different reasons for the WebDriver controled Web Browser to get detected and simultaneously get blocked. You can find a couple of detailed discussion in:
Browser page crash may leads to InvalidSessionIdException. Selenium says to us: session deleted because of page crash. Check if your browser page still exists when you got your errors.
Here an example of a traceback of this case:
[2021-06-28 15:05:43,787: ERROR/ForkPoolWorker-2] Message: invalid session idTraceback (most recent call last): ... File "/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/webdriver.py", line 333, in get self.execute(Command.GET, {'url': url}) File "/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/webdriver.py", line 321, in execute self.error_handler.check_response(response) File "/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response raise exception_class(message, screen, stacktrace)selenium.common.exceptions.WebDriverException: Message: unknown error: session deleted because of page crashfrom tab crashed (Session info: chrome=83.0.4103.61)During handling of the above exception, another exception occurred:Traceback (most recent call last): ... File "/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/webdriver.py", line 580, in find_elements_by_class_name return self.find_elements(by=By.CLASS_NAME, value=name) File "/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/webdriver.py", line 1007, in find_elements 'value': value})['value'] or [] File "/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/webdriver.py", line 321, in execute self.error_handler.check_response(response) File "/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response raise exception_class(message, screen, stacktrace)selenium.common.exceptions.InvalidSessionIdException: Message: invalid session idIf you want some technical details, take a look at Chromium sources where you can find string session deleted because of page crash.