Hello,
Thank you for contacting Rank Math, and sorry for any inconvenience caused.
Can you please share the error log with us?
Having an error log will help us determine what is causing the critical error on your website.
You can follow this guide to enable debugging in WordPress
https://wordpress.org/support/article/debugging-in-wordpress/ or you can get in touch with your web host, they will help you locate the log file.
Also, make sure that the PHP values are not too low to handle the processes.
You can check that by going to WordPress dashboard > Tools > Site Health > Info tab > Server
If the values are low, please contact your web host and ask them to set the following values:
PHP Memory Limit: 512M
Max input time: 150
PHP time limit: 120
PHP max input variables: 1000
We really look forward to helping you.
I solved the problem by changing as indicated the “PHP Memory Limit” thank you
Hello,
We are super happy that your issue is resolved. 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.