Bug#1050927: Fatal error: Uncaught TypeError: ldap_read(): Argument #2 ($base) must be of type string when argument #1 ($ldap) is an LDAP instance in /usr/share/gosa/include/class_ldap.inc:408

[Daniel Teichmann]

Package: gosa
Version: 2.8+
Severity: important
X-Debbugs-Cc: daniel.teichmann at das-netzwerkteam.de

This happens if you select multiple users and try to edit them.
$dn is an array and the LDAP method expects a string.