Error thrown – Call to a member function get_entities() on null

Hello,

Thank you for your query and we are so sorry about the trouble this must have caused.

This issue has been identified by the NextGen Gallery developers and the fix for it would come from their team in one of the upcoming updates as mentioned here: https://wordpress.org/support/topic/rank-math-error-thrown-call-to-a-member-function-get_entities-on-null/

Since everything is documented in their development cycle we simply need to wait for them to fix that.

In the meantime to have sitemaps working again you can try disabling the image sitemap by going to WordPress Dashboard > Rank Math > Sitemap Settings and disabling this option:

That should make it possible to load the sitemaps once again because the data from NextGen wouldn’t be fetched anymore.

Don’t hesitate to get in touch if you have any other questions.

Hello,

We are super happy that this resolved your issue. If you have any other questions in the future, know that we are here to help you.

If you don’t mind me asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.

If you do have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.

Thank you.