Passing a variable to register_taxonomy()

I'm trying to create multiple taxonomies. As follows.....

$taxonomies = $wpdb->get_results( "SELECT * FROM $table_name" );
foreach ($taxonomies as $taxonomy) {
  //stuff that defines the taxonomy
register_taxonomy( $taxonomy->singular_name, 'book', $tagArgs );
}

It appears that WP dislikes regestering the taxonomy with $taxonomy->singular_name. Xdebug givies me the following error.

Notice: Trying to get property of non-object in /home/wpplugin/public_html/wp-includes/link-template.php on line 898

I've tried several diffent things. Converting the object to an array and feeding that to register_taxonomy(), I've tride casting $taxonomy->singular_name as a string and a few other random guessees that yeilded the same result. The only thing that works is putting a quoted string in place of $taxonomy->singular_name which won't fit my needs.

Does any one have any ideas on this?? Thanks Greg

Full code here.....

add_action( 'init', 'create_book_taxonomies', 0 );function create_book_taxonomies() {
global $wpdb;
$table_name = $wpdb->prefix . 'wlc_custom_taxonomy';
$taxonomies = $wpdb->get_results( "SELECT * FROM $table_name" );
foreach ($taxonomies as $taxonomy) {
    $enterMeOnce = $taxonomy->singular_name;
    $book = $taxonomy->singular_name;

    if($taxonomy->singular_name != 'singular-name'){ //exclude the default table row
        $resLabels = array(
                'name'               => _x( $enterMeOnce , 'Post Type General Name' ),
                'singular_name'      => _x( $enterMeOnce , 'Post Type Singular Name' ),
                'menu_name'          => __( $enterMeOnce  ),
                'name_admin_bar'     => __( $enterMeOnce  ),
                'all_items'          => __( $enterMeOnce  ),
                'add_new_item'       => __( 'Add New ' . $enterMeOnce  ),
                'edit_item'          => __( 'Edit ' . $enterMeOnce  ),
                'new_item'           => __( 'New ' . $enterMeOnce  ),
                'view_item'          => __( 'View ' . $enterMeOnce  ),
                'search_item'        => __( 'Search ' . $enterMeOnce  ),
                'not_found'          => __( 'No '.$enterMeOnce .' found' ),
                'not_found_in_trash' => __( 'No '.$enterMeOnce .' found in trash' ),
                'description'         => __( $enterMeOnce .' are special posts that are showcased on the '.$enterMeOnce .' page.' ),
            );
        $resArgs = array(
                'labels' => $resLabels,

                'public'              => true,
                'exclude_from_search' => false,
                'publcly_queryable'   => true,
                'show_ui'             => true,
                'show_in_menu'        => true,
                'show_in_nav_menus'   => true,
                'show_in_admin_bar'   => true,
                'menu_position'       => 5,
                'menu_icon'           => 'dashicons-lightbulb',
                'capability_type'     => 'post',
                'meta_box_cb'         => true,
                'show_admin_column'   => true,
                'hierarchical'        => true,
                'has_archive'         => true,
                //'rewrite'           => true,
                /*'capabilities'        => array(
                    'manage_terms' => 'manage_resource',
                    'edit_terms'   => 'manage_categories',
                    'delete_terms' => 'manage_categories',
                    'assign_terms' => 'edit_posts'
                ),*/
                'supports'           => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'post_format' )
            );

    register_post_type( $book , $resArgs );

        $labels = array(
                'name'                       => _x( $taxonomy->name . ' Categories', 'Taxonomy General Name', 'text_domain' ),
                'singular_name'              => _x( $taxonomy->name . ' Category', 'Taxonomy Singular Name', 'text_domain' ),
                'menu_name'                  => __( $taxonomy->name . ' Categories', 'text_domain' ),
                'all_items'                  => __( 'All Categories', 'text_domain' ),
                'parent_item'                => __( 'Parent Category', 'text_domain' ),
                'parent_item_colon'          => __( 'Parent Category:', 'text_domain' ),
                'new_item_name'              => __( 'New Resource Category', 'text_domain' ),
                'add_new_item'               => __( 'Add New Resource Category', 'text_domain' ),
                'edit_item'                  => __( 'Edit Category', 'text_domain' ),
                'update_item'                => __( 'Update Category', 'text_domain' ),
                'separate_items_with_commas' => __( 'Separate resource cat names with commas', 'text_domain' ),
                'search_items'               => __( 'Search Resource Categories', 'text_domain' ),
                'add_or_remove_items'        => __( 'Add or remove resource categories', 'text_domain' ),
                'choose_from_most_used'      => __( 'Choose from the most used Categories', 'text_domain' ),
                'not_found'                  => __( 'Resource Category Not Found', 'text_domain' ),
                'slug'                       => __( $taxonomy->name . 'category' )
            );

            $args = array(
                'labels'                     => $labels,
                'hierarchical'               => true,
                'public'                     => true,
                'has_archive'                => true,
                'show_ui'                    => true,
                'show_admin_column'          => true,
                'show_in_nav_menus'          => true,
                'show_tagcloud'              => false,
                'rewrite'                    => true,
            );


            register_taxonomy( $taxonomy->singular_name, array( $book ), $args );

            $tagLabels = array(
                'name'                       => _x( 'Writers', 'taxonomy general name' ),
                'singular_name'              => _x( 'Writer', 'taxonomy singular name' ),
                'search_items'               => __( 'Search Writers' ),
                'popular_items'              => __( 'Popular Writers' ),
                'all_items'                  => __( 'All Writers' ),
                'parent_item'                => null,
                'parent_item_colon'          => null,
                'edit_item'                  => __( 'Edit Writer' ),
                'update_item'                => __( 'Update Writer' ),
                'add_new_item'               => __( 'Add New Writer' ),
                'new_item_name'              => __( 'New Writer Name' ),
                'separate_items_with_commas' => __( 'Separate writers with commas' ),
                'add_or_remove_items'        => __( 'Add or remove writers' ),
                'choose_from_most_used'      => __( 'Choose from the most used writers' ),
                'not_found'                  => __( 'No writers found.' ),
                'menu_name'                  => __( $taxonomy->name . ' Tags' ),
            );

            $tagArgs = array(
                'hierarchical'          => false,
                'labels'                => $tagLabels,
                'show_ui'               => true,
                'show_admin_column'     => true,
                'update_count_callback' => '_update_post_term_count',
                'query_var'             => true,
                'rewrite'               => array( 'slug' => 'writer' ),
            );

            register_taxonomy( $taxonomy->singular_name, $book, $tagArgs );


    }
}
}