Login as reseller is slow: Invalid argument supplied for foreach()

Symptoms

• When trying to log in as a reseller in Resellers > Log In as Reseller next to reseller name, the login consuming a lot of time (about a minute).
• The following error can be found in the file /var/log/plesk/panel.log :
  

  CONFIG_TEXT: ERR [1] PHP Warning: Invalid argument supplied for foreach(); File: /usr/local/psa/admin/plib/CommonPanel/Controller/Helper/Module.php, Line: 181

• DigitalOcean DNS extension is not installed, or was already removed from Plesk .

Cause

Bug in the extension SitePad Website Builder .

Resolution

As a workaround, disable SitePad Website Builder in Extensions > My Extensions > select SitePad Website Builder > Disable .

In order to speed up fixing of this bug, report it to the extension developer at https://softaculous.com/support/ .