Looks like we just hit this issue today with our Production application. Seems that there is possibly an issue for any Meteor applications using Iron Router when loaded on the latest version of Chrome (51.x.x)…
More information here: https://productforums.google.com/forum/#!msg/chrome/TJBZZjmCEik/3cDko_E_CQAJ
Unfortunately we have another issue which means it is quite difficult for us to rebuild and redeploy this application at this current time. Does anyone have any suggestions for how we can overcome this issue without doing the full rebuild/redploy cycle?