I'm not going to go back and open up the developer tools to see which part of the buggy javascript UI crashed. I will say again though that the UI was throwing 'unhandled exceptions'. Do I really need to defend myself here? When is it ever a good idea for a user of a piece of software; especially ERP software which by it's very nature will interact with non-technical users constantly, to ever see an unhandled exception. Come on.
Just for fun. I went back to their website: demo1.openerp.com. It takes 2 seconds to crash their websites by interacting with it. Just click on their navigation links on the top of the page quickly.
Here is a link: http://imgur.com/fp8oW
This is an easily reproducible problem. Come on.