Can not add new domains anymore

[cwerk]

When I try to add a new domain I get the following errors:

Unable to create IP Address object: Table->select() failed: no such row in the table

0: /usr/local/psa/admin/plib/class.CreateDomainForm.php:43
ip_pool_slist(object of type IPPool)
1: /usr/local/psa/admin/plib/class.CreateDomainForm.php:139
CreateDomainForm->assign(boolean true, string '', object of type Client, object of type IPPool, array, boolean true, object of type BsDomain, boolean false)
2: /usr/local/psa/admin/htdocs/domains/create_domain.php:257


I added a new SSL-certificate 2 days ago, maybe it has something to do with it...