qListForm Error when assigning a GroupName to a field, error “The following error occurred: Object reference not set to an instance of an object”.

Consider the following scenario:

There is a list with a Lookup column. You add a qListForm webpart to a page and associate it with the list. Then set the DisplayFields to be the ID field only, and the qListForm works correctly. If you give the ID Field (or any other field that is selected to display) a GroupName value, the qListForm gives an error ‘The following error occurred: Object reference not set to an instance of an object.’

This only happen if the list have a Lookup Field. This happen to SharePoint 2007 and 2010.