White screen after login page in Plesk: TypeError: Cannot read properties of undefined (reading ‘config’)

Symptoms

• After logging into Plesk, white screen is displayed and the following errors are displayed in the browser console:

TypeError: Cannot read properties of undefined (reading 'config')
Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'config')
Uncaught (in promise) Error: Cannot query field "webSocket" on type "Config".
TypeError: Cannot read properties of null (reading 'select')
Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'container')
TypeError: Cannot read properties of undefined (reading 'logo')
TypeError: E is undefined

• The same error can occur in an attempt to access PHP Settings or DNS Settings pages in Domains > example.com.

Cause

Corrupted Plesk installation, possibly due to previously failed update.

Resolution

1. Connect to the server via SSH
2. Install the missing packages using the following command:

# plesk installer --select-release-latest --upgrade-installed-components