ERROR Unable to query: Got error 134 from table handler

[Multitec]

I get all of a sudden when I want to view the list of my clients the following error message:

0: /usr/local/psa/admin/plib/common_func.php3:203 psaerror(string "Unable to query: Got error 134 from table handler")
1: /usr/local/psa/admin/plib/class.ClientsList.php3:220 db_query(string "SELECT d.cl_id, l.value as lim FROM domains d, clients c, Limits l WHERE d.cl_id=c.id AND c.limits_id=l.id AND l.limit_name="disk_space" AND l.value>=0 GROUP BY d.cl_id HAVING sum(d.real_size) > lim")
2: /usr/local/psa/admin/plib/class.cList.php3:94 ClientsList->fetchClientsList()
3: /usr/local/psa/admin/plib/class.cList.php3:114 ClientsList->fetchList()
4: /usr/local/psa/admin/htdocs/clients/clients.php3:86 ClientsList->init()

Any ideas or suggestions?

Regards,

Multitec