Graph Report - traffic by keyword

I wanted to put feedback into defect tracker however it gives me infinite loop on login, not sure where’s problem, anyway here’s problem

  • Go demo site and switch period to “Week”
  • Visitors --> Custom Variables
  • Expand “Forum status” and click graph for either “Anonymous” or “LoggedIn user”

API returned an error: Date format must be: YYYY-MM-DD, or 'today' or 'yesterday' or any keyword supported by the strtotime function (see http://php.net/strtotime for more information)

Having this repro on my local with piwik-1.7.2-rc6