CFME - Status 500 Internal Server Error when selecting Monitor Menu

Solution Verified - Updated -

Issue

When selecting the menu item Monitor (or the submenus), a popup appears with the error message :
URL https://<cloudforms.url>/api/tags?expand=resources&attributes=category,categorization

Status 500 Internal Server Error

Content-Type application/json; charset=utf-8

Data {"error":{"kind":"internal_server_error","message":"undefined method `name' for nil:NilClass","klass":"NoMethodError"}}

Environment

CloudForms 4.x

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