The new statistics page returned "No Inventory data has been found", which I tracked down to this line in count_habtm:
label = eval(assocication.camelize).send("find",a.to_i).to_label if a
causing this traceback:
NoMethodError: undefined method `to_label' for #<Puppetclass:0xb72bb1e8> from /usr/share/foreman/vendor/rails/activerecord/lib/active_record/attribute_methods.rb:260:in `method_missing' from /usr/share/foreman/app/models/host.rb:375:in `count_habtm' from /usr/share/foreman/app/models/host.rb:373:in `each' from /usr/share/foreman/app/models/host.rb:373:in `count_habtm'
Changing the to_label to to_s fixed the glitch for me.