I'm doing a crawl analysis for a website and finding all these duplicate URLs with "null" being added to them and have no clue what could be causing this.

[julianne.amann]

Does anyone know what could be causing this? Our dev team thinks it's caused by mobile pages they created a while ago but it is adding 1000's of additional URLs to the crawl report and being indexed by Google. They don't see it as a priority but I believe these could be very harmful to our site.

examples from URL string:
uruguay-argentina-chilenullnull/days
rainforests-volcanoes-wildlifenullnull/reviews
of-eastern-europenullnullnullnull/hotels

[seanginnaw]

Hi there,

This looks to be something to do with a URL generator that is dynamically creating URLs based on certain categories being present.

The downside being that those categories look to have been removed, hence the 'null' values being passed through.

I would push this back to your developers as a serious issue, there could be a large amount of duplication occurring if you're not careful.

All the best,

Sean