Unable to add domain to an existing webspace in Plesk: Unable to load object of type IPAddress with id=XX

Symptoms

• Unable to add domain to an existing webspace:

  PLESK_ERROR: An error occurred during domain update: An error occurred during changing of hosting settings: Unable to load object of type IPAddress with id=XX: IPAddress: unable to select: no such row in the table

• plesk repair db returns the following error:

  # Plesk repair db -n
  ...
  Checking the consistency of the Plesk database
  The following domains are assigned to already removed IP addresses.
  Reassign the domains to existing IP addresses:
  example.com ........................................... [ERROR]
  
  Error messages: 1; Warnings: 0; Errors resolved: 0
  exit status 1

Cause

The issue is caused by a database inconsistency: IP pool of the customer for whom the Domain is created contains a reference to a non-existent IP address.

Resolution

1. Connect to the server via SSH.

2. Find all affected domains:

   # plesk db "select d.name from domains d, dom_param dp where dp.val not in (select id from IP_Addresses) and dp.param='ip_addr_id' and d.id=dp.dom_id"
   +-------------------------------------------+
   | name
   +-------------------------------------------+
   | example.com
   +-------------------------------------------+

3. Log in to Plesk.

4. Navigate to Domains > example.com > Web Hosting Access and set the correct IP address in IPv4 address field;

5. Repeat step 4 for all domains listed on step 2.