cPanel Domains page shows Error: Can't use string ("0") as a HASH ref while "strict refs" in use

Symptoms

When listing domains within a cPanel, the domains do not appear and you encounter the following error:

Error: Can't use string ("0") as a HASH ref while "strict refs" in use at /usr/local/cpanel/Cpanel/API/DomainInfo.pm line 132.

Description

This error may occur if the cache files that cPanel reads contain invalid data. Rebuilding the cache and restarting relevant services will clear the error.

Workaround

1. Access the server using SSH as the root user.
2. Rebuild the cPanel userdata cache files with the following command:

   /usr/local/cpanel/bin/userdata_update && /usr/local/cpanel/bin/build_userdata_cache && /usr/local/cpanel/bin/fix_userdata_perms && /usr/local/cpanel/scripts/updateuserdatacache

3. Rebuild the Apache configuration:

   /scripts/rebuildhttpdconf

4. Restart Apache:

   /scripts/restartsrv_httpd

5. Reload the "Domains" page within cPanel, the error will be cleared.