Comment 2 for bug 1894

Traceback (innermost last):

    * Module zope.publisher.publish, line 135, in publish
      object = request.traverse(object)
    * Module zope.publisher.browser, line 494, in traverse
      ob = super(BrowserRequest, self).traverse(object)
    * Module zope.publisher.http, line 382, in traverse
      ob = super(HTTPRequest, self).traverse(object)
    * Module zope.publisher.base, line 270, in traverse
      subobject = publication.traverseName(
    * Module zope.app.publication.publicationtraverse, line 56, in traverseName
      ob2 = adapter.publishTraverse(request, nm)
    * Module canonical.launchpad.webapp.metazcml, line 393, in publishTraverse
      traversed_to = getattr(self.context, self._getter)(name)
    * Module canonical.launchpad.database.bugset, line 18, in __getitem__
      item = self.table.selectOne(self.table.q.id == id)
    * Module sqlobject.main, line 1038, in selectOne
      connection=connection))
    * Module sqlobject.main, line 1495, in __iter__
      return conn.iterSelect(self)
    * Module sqlobject.dbconnection, line 635, in iterSelect
      select, keepConnection=True)))
    * Module sqlobject.dbconnection, line 567, in __init__
      self.dbconn._executeRetry(self.rawconn, self.cursor, self.query)
    * Module sqlobject.dbconnection, line 204, in _executeRetry
      return cursor.execute(query)
    * Module zope.app.rdb, line 283, in execute
      return self.cursor.execute(operation)

ProgrammingError: ERROR: invalid input syntax for integer: "+upstreamtask" SELECT BugSubscription.id, BugSubscription.bug, BugSubscription.person, BugSubscription.subscription FROM BugSubscription WHERE (BugSubscription.id = '+upstreamtask')