ContextQMD
Back to Content

Invalid session ID

files/en-us/web/webdriver/reference/errors/invalidsessionid/index.md

latest1.8 KB
Original Source

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.

Example

Explicit session deletion

A WebDriver session is explicitly deleted when quitting:

python
from selenium import webdriver
from selenium.common import exceptions

session = webdriver.Firefox()
print("Current session is {}".format(session.session_id))
session.quit()

try:
    session.get("https://mozilla.org")
except exceptions.InvalidSessionIdException as e:
    print(e.message)

Output:

plain
Current session is 46197c16-8373-469b-bc56-4c4d9e4132b4
No active session with ID 46197c16-8373-469b-bc56-4c4d9e4132b4

Implicit session deletion

The session can also be implicitly deleted if you close the last window or tab:

python
from selenium import webdriver
from selenium.common import exceptions

session = webdriver.Firefox()
print("Current session is {}".format(session.session_id))

# closes current window/tab
session.close()

try:
    session.get("https://mozilla.org")
except exceptions.InvalidSessionIdException as e:
    print(e.message)

Output:

plain
Current session is 46197c16-8373-469b-bc56-4c4d9e4132b4
No active session with ID 46197c16-8373-469b-bc56-4c4d9e4132b4

See also