Datenbankfehler bei Kategoriedetailansicht

$getParents = 
            ( is_page() )
            ?    # Pages
                $wpdb->get_results("
                    SELECT    post_parent AS category_parent
                    FROM    {$wpdb->posts}
                    WHERE    ID IN ({$fromChilds})
                ")
            :     # Posts / Categories
                $wpdb->get_results("
                    SELECT    category_parent
                    FROM    {$wpdb->categories}
                    WHERE    cat_ID IN ({$fromChilds})
                ");

if( !is_int( $ofParent ) ) {
            if( is_page() )
                # Different handling for Pages
                $getID = $wpdb->get_results("
                    SELECT    ID as cat_ID
                    FROM    {$wpdb->posts}
                    WHERE    post_title = '{$ofParent}'
                    OR        post_name = '{$ofParent}'
                    LIMIT    0,1
                ");
            else
                # Get catID
                $getID = $wpdb->get_results("
                    SELECT    cat_ID
                    FROM    {$wpdb->categories}
                    WHERE    cat_name = '{$ofParent}'
                    OR        category_nicename = '{$ofParent}'
                    LIMIT    0,1
                ");