Importing Utility Session into Catalog

I have been using the empty Utility Session approach to use Capture One (15.4.0.22) with Photo Mechanic 6 and tried to import the cosessiondb into my Capture One catalog to import all of the edits I had made but each time I try Capture One crashes.  

I have imported previous "proper" sessions without trouble but the Utility Session will not work.

Any suggestions?