Error on dashboard stream when trying to charge older stream

Hello,

when a user is connected on dashboard and scroll down the stream is trying to charge older stream post and it doesn't work :
i get a "more or less blank page", see :
http://awesomescreenshot.com/0e72zwn5d5
and it continue to try to charge the page...

Using last 1.2.16
error still 1.2.15 (may be 1.2.14)

Using last firefox 30.0 on macosx

Can you have a look on your side please
Thanks in advance
Loïc