Skip to content
Home ยป Solve Selenium error “session deleted because of page crash”

Solve Selenium error “session deleted because of page crash”

I’ve been dockerizing web scrapers in order to add them in a data pipeline. Web scraping is always a little bit of living on the edge because you never know which elements might have changed and which errors will pop up. In this blog post I would like to elaborate on the “Session deleted because of page crash” error, which is more of a Docker issue than a scraping issue.

When running the container, the following error popped up in the CLI:

selenium.common.exceptions.WebDriverException: Message: unknown error: session deleted because of page crash

There aren’t a lot of causes for a webpage crash. And if you’re using Docker, Bayesian reasoning should tell you that the described error can probably be solved with the solution below.

Here’s what’s happening: there’s not enough of (shared) memory allocated to the Docker container to fully load a web page. That’s because modern web applications tend to be very RAM-intensive. The default allocated memory of 64MB might simply not be enough.

You can adjust the shared memory when running/composing a Docker container.

Via the CLI:

docker run -it --shm-size=1gb oracle11g /bin/bash

Via the compose file (YAML):

version: '3.5'
        image: 'selenium/standalone-chrome'
            - '4444:4444'
        shm_size: '1gb'

If you would to know what valid parameter values are:

Size of /dev/shm. The format is <number><unit>. number must be greater than 0. Unit is optional and can be b (bytes), k (kilobytes), m (megabytes), or g (gigabytes). If you omit the unit, the system uses bytes. If you omit the size entirely, the system uses 64m.

Docker run reference

And that’s it. Great success!

Say thanks, ask questions or give feedback

Technologies get updated, syntax changes and honestly… I make mistakes too. If something is incorrect, incomplete or doesn’t work, let me know in the comments below and help thousands of visitors.

4 thoughts on “Solve Selenium error “session deleted because of page crash””

Leave a Reply

Your email address will not be published. Required fields are marked *