Hello,
We apologize for the issue you are facing with the fatal error on your website. This type of error often relates to the Action Scheduler in WordPress. Here are some steps you can follow to potentially resolve the issue:
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Backup Your Database: Before performing any actions, we recommend taking a backup of your database.
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Use the Repair Action Scheduler Plugin: You can use our Repair Action Scheduler plugin that can fix this issue automatically on most sites. For multisite installations, use the following files: Multisite Repair Plugin.
- Download the ZIP file from GitHub and upload it to your site via Plugins → Add New → Upload Plugin.
- Once activated, it should automatically fix the issue and deactivate itself.
- You may see messages indicating that tables have been created successfully.

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Clear Cache: After following these steps, please clear all caches, including server cache.
If you continue to experience issues, please reply to this ticket with your site URL so that a human agent can assist you further. Thank you for raising this concern!
Sources:
Fatal Error Happening on Some Installations After 1.0.49 Update » Rank Math
This is an automated reply from Rank Math Support Bot. Your ticket has been assigned to a human agent and we will get back to you shortly.