SSL/TLS Certificates page is not opening in Plesk: A table must have a primary key, but none was found for table 'Orders'

Symptoms

• The page SSL/TLS Certificates at Domains > example.com fails to open:

  PLESK_INFO: 500 Zend_Db_Table_Exception
  A table must have a primary key, but none was found for table 'Orders'

• Let's Encrypt certificate of a domain is not renewed automatically.

Cause

Corrupted database of the SSL It! extension.

Resolution

Reinstall the extension:

1. Connect to the Plesk server via SSH (Linux) / RDP (Windows Server).

2. Uninstall the SSL It! extension (on Windows Server, start a command prompt as an Administrator):

   # plesk bin extension --uninstall sslit

3. Install the extension back:

   # plesk bin extension --install sslit