Task Manager; folder listing a Workflow for a filtered out Account causes unhandled exception

A Task Manager Workflow folder listing a Workflow for a filtered out Account causes unhandled exception.

This can occur if the currently logged in User belongs to a User Group which has Account filters but is also the allocated Workflow User for an Account that they should not be able to view.

A workaround for this issues is to locate the offending Workflow and, from the Users page, remove or change the allocated User. This will prevent the Workflow from appearing in the Task Manager for this User and therefore causing an error.