Unable to open “Subscriptions” menu in Plesk: Call to a member function getDescription() on null

Symptoms

• Opening the menu Subscriptions in Plesk fails:

  Error: Call to a member function getDescription() on null (Subscriptions.php:231)

• When logged in to Plesk under a customer account, the menu WordPress in the left navigation panel is missing:
  

Cause

The bug in WP Toolkit extension EXTWPTOOLK-10567. The bug was fixed in WP Toolkit version 6.2.4.

Resolution

Update WP Toolkit to the latest version.