Steps to reproduce:
0) login to Piwik instance.
1) go to Settings -> Websites
2) click View tracking code for one of the sites
3) click on "Dashboard" link in top menu
The parameter 'period' isn't set in the Request, and a default value wasn't provided.
View tracking code URL needs to be fixed, because there should be period and date parameters. I think that there are also other issues connected with Piwik internal linking.