Why Does My Selenium InstaPy Script on a DigitalOcean Server Keep Getting \'Invalid Session ID\' and \'Session Deleted Because of Page Crash\' Errors?

unknown error: session deleted because of page crash from unknown error: cannot determine loading status from tab crashed with ChromeDriver Selenium

Question:

In InstaPy, an error occurs periodically when running a Python and Selenium script from Cron. The error message indicates an "invalid session id" and "unknown error: session deleted because of page crash from unknown error: cannot determine loading status from tab crashed." Despite posting on GitHub Repo, the issue remains unresolved. The script runs on a headless mode digital ocean ubuntu server with Chrome web driver. What could be causing this problem and how can it be fixed?

Answer:

The primary exception causing the error is:

selenium.common.exceptions.WebDriverException: Message: unknown error: session deleted because of page crash
from unknown error: cannot determine loading status
from tab crashed

To address this issue, consider the following solutions:

• Add the following chrome_options:

  chrome_options.add_argument('--no-sandbox')

• Fix a small /dev/shm size:

  sudo mount -t tmpfs -o rw,nosuid,nodev,noexec,relatime,size=512M tmpfs /dev/shm

• Share host /dev/shm option:

  -v /dev/shm:/dev/shm

• Disable /dev/shm usage:

  chrome_options.add_argument('--disable-dev-shm-usage')

from tab crashed:

This error relates to the Linux operating system attempting to always use /dev/shm for non-executable memory. A fix was implemented with Chrome v65.0.3299.6.

Reference:

• [org.openqa.selenium.SessionNotCreatedException: session not created exception from tab crashed error when executing from Jenkins CI server](https://stackoverflow.com/questions/50364109/org-openqa-selenium-sessionnotcreatedexception-session-not-created-exception)

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