When I click many times, I get this error:

2015-02-05 17:11:11,753 3812 ERROR ? openerp.addons.web.http.JSONRequest.dispatch: An error occured while handling a json request Traceback (most recent call last): File "/opt/openerp7/git/odoo/addons/web/http.py", line 204, in dispatch response["result"] = method(self, **self.params) File "/opt/openerp7/git/odoo/addons/web/controllers/main.py", line 1039, in load_needaction return req.session.model('ir.ui.menu').get_needaction_data(menu_ids, req.context) File "/opt/openerp7/git/odoo/addons/web/session.py", line 159, in model raise SessionExpiredException("Session expired") SessionExpiredException: Session expired

And finally, a popup message displays with: "Your OpenERP session expired. Please refresh the current web page."

This is a random issue.

Any idea, to solve this issue.