Hello,
Thank you for contacting Rank Math support, and sorry for any inconvenience that might have been caused due to that.
Please refer to these guides to help you with your issue: https://rankmath.com/kb/delete-old-analytics-data/
https://rankmath.com/kb/zero-search-traffic-error/
If that doesn’t help, follow the steps below to create a troubleshooting log so that we can check the issue further:
Step #1. First, add the following filter to your website:
add_filter( 'rank_math/analytics/log_response', '__return_true' );
Here is a guide you can follow to add the filter: https://rankmath.com/kb/wordpress-hooks-actions-filters/
Step #2. After adding the filter, please run the pending Scheduled Action from your WordPress Dashboard → Tools → Scheduled Actions → Pending:
If in your case, you do not see the Scheduled Actions menu, then you can try visiting the following URL:
https://yourdomain.com/wp-admin/tools.php?page=action-scheduler&status=pending
Ensure that you replace yourdomain.com with your own domain in the above link.

Step #3. When some actions have completed running, please check the Analytics log under /wp-content/uploads/rank-math and share that with us.
You can use a tool like Dropbox/Pastebin for debug log files and share the generated links here.
Looking forward to helping you.