[horde] H6 - Address Book edit error

[horst.simon2 at icloud.com]

Hi,

I am getting following error when I am clicking on editing the address book. I can add users and edit users, but not the address book.

Kind Regards, 
Horst Simon
A fatal error has occurred

addcslashes(): Argument #1 ($string) must be of type string, true given

in /opt/local/www/apache2/horde/vendor/horde/core/src/Horde.php:1284
1. require_once() /opt/local/www/apache2/horde/web/turba/addressbooks/edit.php:3
2. Turba_Form_EditAddressBook->__construct() /opt/local/www/apache2/horde/vendor/horde/turba/addressbooks/edit.php:36
3. Horde::popupJs() /opt/local/www/apache2/horde/vendor/horde/turba/lib/Form/EditAddressBook.php:154
4. Horde\Core\Horde::popupJs() /opt/local/www/apache2/horde/vendor/horde/core/lib/Horde.php:932
5. addcslashes() /opt/local/www/apache2/horde/vendor/horde/core/src/Horde.php:1284

Details

The full error message is logged in Horde's log file, and is shown below only to administrators. Non-administrative users will not see error details.

TypeError Object
(
    [message:protected] => addcslashes(): Argument #1 ($string) must be of type string, true given
    [string:Error:private] => TypeError: addcslashes(): Argument #1 ($string) must be of type string, true given in /opt/local/www/apache2/horde/vendor/horde/core/src/Horde.php:1284
Stack trace:
#0 /opt/local/www/apache2/horde/vendor/horde/core/src/Horde.php(1284): addcslashes()
#1 /opt/local/www/apache2/horde/vendor/horde/core/lib/Horde.php(932): Horde\Core\Horde::popupJs()
#2 /opt/local/www/apache2/horde/vendor/horde/turba/lib/Form/EditAddressBook.php(154): Horde::popupJs()
#3 /opt/local/www/apache2/horde/vendor/horde/turba/addressbooks/edit.php(36): Turba_Form_EditAddressBook->__construct()
#4 /opt/local/www/apache2/horde/web/turba/addressbooks/edit.php(3): require_once('...')
#5 {main}
    [code:protected] => 0
    [file:protected] => /opt/local/www/apache2/horde/vendor/horde/core/src/Horde.php
    [line:protected] => 1284
    [trace:Error:private] => Array
        (
            [0] => Array
                (
                    [file] => /opt/local/www/apache2/horde/vendor/horde/core/src/Horde.php
                    [line] => 1284
                    [function] => addcslashes
                )

            [1] => Array
                (
                    [file] => /opt/local/www/apache2/horde/vendor/horde/core/lib/Horde.php
                    [line] => 932
                    [function] => popupJs
                    [class] => Horde\Core\Horde
                    [type] => ::
                )

            [2] => Array
                (
                    [file] => /opt/local/www/apache2/horde/vendor/horde/turba/lib/Form/EditAddressBook.php
                    [line] => 154
                    [function] => popupJs
                    [class] => Horde
                    [type] => ::
                )

            [3] => Array
                (
                    [file] => /opt/local/www/apache2/horde/vendor/horde/turba/addressbooks/edit.php
                    [line] => 36
                    [function] => __construct
                    [class] => Turba_Form_EditAddressBook
                    [type] => ->
                )

            [4] => Array
                (
                    [file] => /opt/local/www/apache2/horde/web/turba/addressbooks/edit.php
                    [line] => 3
                    [args] => Array
                        (
                            [0] => /opt/local/www/apache2/horde/vendor/horde/turba/addressbooks/edit.php
                        )

                    [function] => require_once
                )

        )

    [previous:Error:private] => 
)