tazitiz

i edited the file:
CTXPS_Security.phh

look for the line containing the function definition start:
public static function get_term_protection($term_id,$taxonomy){

replace this function by:

public static function get_term_protection($term_id,$taxonomy){
        //If this branch isn't protected, just stop now and save all that processing power
        if (!CTXPS_Queries::check_term_protection($term_id,$taxonomy)){
            return false;
        }

        //If we're still going, then it means something above us is protected, so lets get the list of permissions
        global $wpdb;
        $return = array();
        $group_array = array();
        /**Gets the parent id of the current page/post*/
        $parent_id = get_term($term_id,$taxonomy);
        $parent_id = (integer)$parent_id->parent;
        /**Gets the ctx_ps_security data for this post (if it exists) - used to determine if this is the topmost secured page*/
        //$amisecure = get_post_meta($postid,'ctx_ps_security',true);

        //1. If I am secure, get my groups
        //if(!empty($amisecure)){
            //Get Group relationship info for this page from wp_ps_security, join wp_posts on postid
            $groups = CTXPS_Queries::get_groups_by_object('term',$term_id, true);

            //If 0 results, dont do anything. Otherwise...
            if(!empty($groups)){
                foreach($groups as $group){
                    $group_array[$group->group_id] = $group->group_title;
                }unset($group);
            }
        //}
        //Add an item to the array. 'pageid'=>array('groupid','groupname')
        $return[(string)$term_id] = $group_array;
        unset($group_array);
        //2. If I have a parent, recurse
            //Using our earlier results, check post_parent. If it's != 0 then recurse this function, adding the return value to $array
            if($parent_id != 0){
                //$recursedArray = CTXPS_Security::get_protection($parentid);
                //$array = array_merge($array,$recursedArray);
                $parent_array = self::get_term_protection($parent_id,$taxonomy);
                if(!!$parent_array){
                  $return += $parent_array;
                }
            }

        //3. Return the completed $array
        return $return;
    }

and change line 362 into:
return self::get_term_protection($content_id,$taxonomy);

this removed the errors for me.

the functionality of not showing the menu items of protected categories and posts still works so this looks like a good addition to the original files.