Error trying to get a non-existent value (appearance, password_hash) in LDAP
Solution 1:
Open template file /usr/share/phpldapadmin/lib/TemplateRender.php
in your favorite editor like:
sudo vi /usr/share/phpldapadmin/lib/TemplateRender.php
Search line
$default = $this->getServer()->getValue('appearance','password_hash');
and change it to
$default = $this->getServer()->getValue('appearance','password_hash_custom');
and save that file and reload browser it will not show this error.