InvalidSessionIdException

[motin]

In a recent Tranco top 500 crawl, this was the most significant error - showed up 34 times. 34/500 = 6.8%.

asctime | 2019-08-15 20:04:19,389
exception | InvalidSessionIdException: Message: Tried to run command without establishing a connection
traceback-0 | Traceback (most recent call last):   File "/opt/OpenWPM/automation/BrowserManager.py", line 483, in BrowserManager     browser_params, manager_params, extension_socket)   File "/opt/OpenWPM/automation/Commands/command_executor.py", line 15, in execute_command     extension_socket=extension_socket)   File "/opt/OpenWPM/automation/Commands/browser_commands.py", line 139, in get_website     close_other_windows(webdriver)
traceback-1 | File "/opt/OpenWPM/automation/Commands/browser_commands.py", line 72, in close_other_windows     main_handle = webdriver.current_window_handle   File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 711, in current_window_handle     return self.execute(Command.W3C_GET_CURRENT_WINDOW_HANDLE)['value']   File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 321, in execute     self.error_handler.check_response(response)
traceback-2 | File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response     raise exception_class(message, screen, stacktrace) InvalidSessionIdException: Message: Tried to run command without establishing a connection

More information at: https://sentry.prod.mozaws.net/operations/web-crawls/issues/6137168/?query=is:unresolved%20CRAWL_REFERENCE:openwpm-crawls/2019_08_15_webcompat_crawl_test_1

[englehardt]

Fixed as part of #255 (comment)