Error after config step in setup

Description

Error when we want to validate the configuration in setup

The error is the following one:

Object: cn=config,ou=fusiondirectory,dc=nodomain  
Error: Object class violation (no objectClass attribute, while operating on "cn=config,ou=fusiondirectory,dc=nodomain" using LDAP server "ldap://localhost:389")

Distribution Name and Version

Debian stretch

FusionDirectory Version

1.4

PHP version used

7

Origin of php packages

Debian

Steps to Reproduce

1. Try to setup FD
2. The error is displayed when you want validate config step

Expected behavior:

No error

Actual behavior:

There is an error

Reproduces how often: 100%

Additional Information

The following error was in syslog

Aug 21 16:55:58 xxx slapd[18027]: No objectClass for entry (cn=config,ou=fusiondirectory,dc=nodomain)