Plesk panel is unaccessible: 500 Server erorr: Cannot read properties of undefined (reading 'viewer')

Symptoms

• Plesk panel is unavailable with the following error:

  500 Server Error
  Message Cannot read properties of undefined (reading 'viewer')
  Stack trace
  TypeError: Cannot read properties of undefined (reading 'pathname')
  at g (https://example.com/cp/javascript/vendors.js?1673367587:31:5109)
  at Module.b (https://example.com/cp/javascript/main.js?1673367587:370:746)
  at m (https://example.com/cp/javascript/main.js?1673367587:370:36196)
  at _s (https://example.com/ui-library/plesk-ui-library.min.js?1673367587:26:62823)
  at _i (https://example.com/ui-library/plesk-ui-library.min.js?1673367587:26:119805)
  at yc (https://example.com/ui-library/plesk-ui-library.min.js?1673367587:26:108787)
  at bc (https://example.com/ui-library/plesk-ui-library.min.js?1673367587:26:108715)
  at gc (https://example.com/ui-library/plesk-ui-library.min.js?1673367587:26:108578)
  at ic (https://example.com/ui-library/plesk-ui-library.min.js?1673367587:26:105719)
  at Ha (https://example.com/ui-library/plesk-ui-library.min.js?1673367587:26:46664)
  at nc (https://example.com/ui-library/plesk-ui-library.min.js?1673367587:26:102815)
  at Ms (https://example.com/ui-library/plesk-ui-library.min.js?1673367587:26:65670)
  at https://example.com/ui-library/plesk-ui-library.min.js?1673367587:26:65529
  at https://example.com/cp/javascript/vendors.js?1673367587:31:14547
  at Set.forEach (<anonymous>)
  at P (https://example.com/cp/javascript/vendors.js?1673367587:31:14535)
  at L (https://example.com/cp/javascript/vendors.js?1673367587:31:14576)
  at M (https://example.com/cp/javascript/vendors.js?1673367587:31:17994)

• The reported plesk  version with "plesk -v" or "plesk db 'select * from upgrade_history'" differs from one that is displayed when running "plesk install --console --all-versions"

Cause

Failed upgrade corrupted Plesk core files

Resolution

1. Connect to the server via SSH.

2. Run the following command to check the current Plesk version:

# plesk -v

3. Execute the following command:

# plesk install --console --all-versions

Choose for installation the same version that is shown in step 2.