After making a "zypper dup" slapd will not start anymore:

-- Unit slapd.service has begun starting up.
Nov 22 11:35:08 zwinger slapd[4582]: @(#) $OpenLDAP: slapd 2.4.44 $
                                             opensuse-buildservice@opensuse.org
Nov 22 11:35:08 zwinger slapd[4582]: UNKNOWN attributeDescription
"OLCDBCACHESIZE" inserted.
Nov 22 11:35:08 zwinger slapd[4582]: UNKNOWN attributeDescription
"OLCDBCHECKPOINT" inserted.
Nov 22 11:35:08 zwinger slapd[4582]: UNKNOWN attributeDescription "OLCDBCONFIG"
inserted.
Nov 22 11:35:08 zwinger slapd[4582]: UNKNOWN attributeDescription
"OLCDBIDLCACHESIZE" inserted.
Nov 22 11:35:08 zwinger slapd[4582]: UNKNOWN attributeDescription "OLCDBINDEX"
inserted.
Nov 22 11:35:08 zwinger slapd[4582]: config error processing
olcDatabase={1}hdb,cn=config:
Nov 22 11:35:08 zwinger slapd[4582]: DIGEST-MD5 common mech free
Nov 22 11:35:08 zwinger slapd[4582]: slapd stopped.
Nov 22 11:35:08 zwinger systemd[1]: slapd.service: Control process exited,
code=exited status=1
Nov 22 11:35:08 zwinger slapd[4582]: connections_destroy: nothing to destroy.
Nov 22 11:35:08 zwinger systemd[1]: Failed to start OpenLDAP Server Daemon.
-- Subject: Unit slapd.service has failed