Piwik collides with JSF navigation?

I just had some hours lost searching for a navigation failure within Java Server Faces. I had a Form which POSTs to the managed Bean, the bean should forward to a response page, done.
But when I insert the piwik code into my template it submits the form, the bean does its work, and now the browser (FF) waits forever for any reply from the server.
Normal navigation with standard GET links works.

Anyone had this problem before? Any solution?

Ther is probably a bug in your JS code. Check with Firebug extension to see the javascript errors?

Are you using client side tracking or server side tracking with Java Tracking Client V1 - PiwikTracker.java · Issue #2172 · matomo-org/matomo · GitHub ?