Warning: Illegal string offset ‘pattern’ error when capturing redirects

Hello, I’m sorry to hear that you’re encountering errors while capturing redirects. The warning “Illegal string offset ‘pattern'” and the fatal error “Cannot unset string offsets” are likely caused by a conflict with another plugin or theme.

To resolve this issue, we recommend following our troubleshooting guide to check for conflicts with other plugins or themes. You can find the guide here.

If the issue persists, please feel free to reach out to our dedicated support team here. They are available 24/7, 365 days a year and will be happy to assist you further.

Sources:
Solving Redirection Issues Using Rank Math SEO Plugin » Rank Math
How to Fix Undefined Offset: 0 Warning » Rank Math

Hello,

From the error log, it seems that there’s a corrupted redirect entry.

In this case, please install and activate the WP PHPMyadmin plugin on your site and connect it to your database so we can check the redirect if it exists there.

Also, we might need to take a closer look at the settings. Please edit the first post on this ticket and include your WordPress & FTP logins in the designated Sensitive Data section.

Please do take a complete backup of your website before sharing the information with us.

It is completely secure and only our support staff has access to that section. If you want, you can use the below plugin to generate a temporary login URL to your website and share that with us instead:

https://wordpress.org/plugins/temporary-login-without-password/

You can use the above plugin in conjunction with the WP Security Audit Log to monitor what changes our staff might make on your website (if any):

https://wordpress.org/plugins/wp-security-audit-log/

We really look forward to helping you.