Undefined variable $ldap_krb5ccname in /var/www/vendor/ltb-project/ltb-common/src/Ltb/Ldap.php on line 63

[luandrea]

I get this error when trying to connect to AD using kerberos GSSAPI:

Undefined variable $ldap_krb5ccname in /var/www/vendor/ltb-project/ltb-common/src/Ltb/Ldap.php on line 63, referer: http://localhost/

It is about this line on Ldap.php:
putenv("KRB5CCNAME=".$ldap_krb5ccname);

Should it be like that:
putenv("KRB5CCNAME=".$this->ldap_krb5ccname);