ProgrammingError: You have an error in your SQL syntax 'INSERT INTO meteringlabels'

Installation works about few months, got this message in logstash. Happens once, there is no surrounding activity (no requests to API).

Havanna, ubuntu-cloud-archive, 2013.2.3-0ubuntu1.1

Aug 17 21:48:59 api1 neutron.openstack.common.db.sqlalchemy.session[12400]: ERROR DB exception wrapped.
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/neutron/openstack/common/db/sqlalchemy/session.py", line 524, in _wrap
    return f(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/neutron/openstack/common/db/sqlalchemy/session.py", line 718, in flush
    return super(Session, self).flush(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1818, in flush
    self._flush(objects)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1936, in _flush
    transaction.rollback(_capture_exception=True)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py", line 58, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1900, in _flush
    flush_context.execute()
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 372, in execute
    rec.execute(self)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 525, in execute
    uow
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 64, in save_obj
    table, insert)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 541, in _emit_insert_statements
    execute(statement, multiparams)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 662, in execute
    params)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 761, in _execute_clauseelement
    compiled_sql, distilled_params
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 874, in _execute_context
    context)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1024, in _handle_dbapi_exception
exc_info
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/util/compat.py", line 195, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 867, in _execute_context

    context)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 324, in do_execute
    cursor.execute(statement, parameters)
  File "/usr/lib/python2.7/dist-packages/MySQLdb/cursors.py", line 174, in execute
    self.errorhandler(self, exc, value)
  File "/usr/lib/python2.7/dist-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler
    raise errorclass, errorvalue

ProgrammingError: (ProgrammingError) (1064, 'You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near \': "\'eaa6e8e248ce4f3784282b0c3f51384a\'", u\'created_at\': "\'2014-08-05T06:34:28+00:\' at line 1') 'INSERT INTO meteringlabels (tenant_id, id, name, description) VALUES (%s, %s, %s, %s)' ({u'keystone_tenant_id': u'eaa6e8e248ce4f3784282b0c3f51384a', u'created_at': u'2014-08-05T06:34:28+00:00', u'updated_at': u'2014-08-05T06:34:28+00:00', u'admin_blocked': False, u'id': 817, u'blocked': False}, '81070432-d514-4606-b564-e7f76138d985', 'billable', '')