Can't add new task

[GaCriv]

Hello,

runbot.openerp.com :
server 3923
addons 6169
web 1840

1/add a new project. Save it.
2/use the link 'Tasks' on the right panel
3/click create. The following bug occurs :

Client Traceback (most recent call last):
  File "/home/odoo/runbot/static/openerp-dev-trunk-5093/server/openerp/addons/web/common/http.py", line 175, in dispatch
    response["result"] = method(controller, self, **self.params)
  File "/home/odoo/runbot/static/openerp-dev-trunk-5093/server/openerp/addons/web/controllers/main.py", line 863, in default_get
    return Model.default_get(fields, req.session.eval_context(req.context))
  File "/home/odoo/runbot/static/openerp-dev-trunk-5093/server/openerp/addons/web/common/openerplib/main.py", line 430, in proxy
    *args)
  File "/home/odoo/runbot/static/openerp-dev-trunk-5093/server/openerp/addons/web/common/openerplib/main.py", line 306, in proxy
    result = self.connector.send(self.service_name, method, *args)
  File "/home/odoo/runbot/static/openerp-dev-trunk-5093/server/openerp/addons/web/common/openerplib/main.py", line 276, in send
    raise fault

Server Traceback (most recent call last):
  File "/home/odoo/runbot/static/openerp-dev-trunk-5093/server/openerp/addons/web/common/openerplib/main.py", line 257, in send
    result = openerp.netsvc.dispatch_rpc(service_name, method, args)
  File "/home/odoo/runbot/static/openerp-dev-trunk-5093/server/openerp/netsvc.py", line 325, in dispatch_rpc
    result = ExportService.getService(service_name).dispatch(method, params)
  File "/home/odoo/runbot/static/openerp-dev-trunk-5093/server/openerp/service/web_services.py", line 580, in dispatch
    res = fn(db, uid, *params)
  File "/home/odoo/runbot/static/openerp-dev-trunk-5093/server/openerp/osv/osv.py", line 120, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/home/odoo/runbot/static/openerp-dev-trunk-5093/server/openerp/osv/osv.py", line 172, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/home/odoo/runbot/static/openerp-dev-trunk-5093/server/openerp/addons/audittrail/audittrail.py", line 495, in execute_cr
    return fct_src(cr, uid, model, method, *args)
  File "/home/odoo/runbot/static/openerp-dev-trunk-5093/server/openerp/osv/osv.py", line 163, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/home/odoo/runbot/static/openerp-dev-trunk-5093/server/openerp/osv/orm.py", line 1487, in default_get
    defaults[f] = self._defaults[f](self, cr, uid, context)
  File "/home/odoo/runbot/static/openerp-dev-trunk-5093/server/openerp/addons/project/project.py", line 529, in _default_project
    return int(context['project_id'])
ValueError: invalid literal for int() with base 10: 'Newproject'