I put the error log here, since it is a little bit long
http://pastie.org/10945816

The reproduce codes app is here
https://github.com/Hongbo-Miao/zonejs-bug

It uses universal-starter, just added socket.io, see in second commit.

To see the error, npm start and open page http://localhost:3000/.

The app works with zone.js 0.6.21, and it shows the error starts from 0.6.22 and also shows in latest 0.6.26