Can't move or join topics

[damon18]

New install of Dizkus from latest pull.

Created new topic under the Carrot forum and tried to move it to Vegetables, then created a second topic and tried to join it with the first. Both times got the error below.

Got

Notice: Undefined index: forum_id in C:\xampp\htdocs\core\src\modules\zikula-dizkus\Zikula\Module\DizkusModule\Api\PermissionApi.php line 123
500 Internal Server Error - ContextErrorException

Stack Trace
in C:\xampp\htdocs\core\src\modules\zikula-dizkus\Zikula\Module\DizkusModule\Api\PermissionApi.php at line 123   -
                } else {
                    if (is_array($args)) {
                        // reconsititute object
                        $forum = $this->entityManager->find('Zikula\Module\DizkusModule\Entity\ForumEntity', $args['forum_id']);
                        $userId = isset($args['user_id']) ? $args['user_id'] : null;
                    } else {
                        return LogUtil::registerArgsError();