RequestExpired when trying to submit a advanced bug search

Steps to reproduce:
1. Go to: https://launchpad.net/products/launchpad/+bugs-advanced
2. Fill the assignee field: <email address hidden>
3. Select the status: New, Accepted, PendingUpload, leaving the other fields with default values
4. RequestExpired A server error occurred

Traceback follows:
Module canonical.database.adapter, line 139, in execute
    raise RequestExpired(args, kwargs)
RequestExpired: (('SELECT Person.id, Person.defaultrenewalperiod, Person.postcode, Person.subscriptionpolicy, Person.teamowner, Person.merged, Person.displayname, Person.password, Person.name, Person.familyname, Person.datecreated, Person.calendar, Person.teamdescription, Person.givenname, Person.country, Person.addressline2, Person.addressline1, Person.city, Person.emblem, Person.hackergotchi, Person.phone, Person.defaultmembershipperiod, Person.timezone, Person.province, Person.karma, Person.organization, Person.homepage_content FROM Person WHERE id in (247596) ORDER BY displayname, familyname, givenname, name',), {})