Additional information for question http://stackoverflow.com/q/21897786/201354

print_r_output.txt

<pre>wpdb Object
(
    [show_errors] => 
    [suppress_errors] => 
    [last_error] => 
    [num_queries] => 14
    [num_rows] => 0
    [rows_affected] => 0
    [insert_id] => 0
    [last_query] => SELECT option_value FROM wp_options WHERE option_name = 'wpseo_internallinks' LIMIT 1
    [last_result] => Array
        (
        )

    [result:protected] => Resource id #197
    [col_info:protected] => 
    [queries] => 
    [prefix] => wp_
    [ready] => 1
    [blogid] => 0
    [siteid] => 0
    [tables] => Array
        (
            [0] => posts
            [1] => comments
            [2] => links
            [3] => options
            [4] => postmeta
            [5] => terms
            [6] => term_taxonomy
            [7] => term_relationships
            [8] => commentmeta
        )

    [old_tables] => Array
        (
            [0] => categories
            [1] => post2cat
            [2] => link2cat
        )

    [global_tables] => Array
        (
            [0] => users
            [1] => usermeta
        )

    [ms_global_tables] => Array
        (
            [0] => blogs
            [1] => signups
            [2] => site
            [3] => sitemeta
            [4] => sitecategories
            [5] => registration_log
            [6] => blog_versions
        )

    [comments] => wp_comments
    [commentmeta] => wp_commentmeta
    [links] => wp_links
    [options] => wp_options
    [postmeta] => wp_postmeta
    [posts] => wp_posts
    [terms] => wp_terms
    [term_relationships] => wp_term_relationships
    [term_taxonomy] => wp_term_taxonomy
    [usermeta] => wp_usermeta
    [users] => wp_users
    [blogs] => 
    [blog_versions] => 
    [registration_log] => 
    [signups] => 
    [site] => 
    [sitecategories] => 
    [sitemeta] => 
    [field_types] => Array
        (
            [post_author] => %d
            [post_parent] => %d
            [menu_order] => %d
            [term_id] => %d
            [term_group] => %d
            [term_taxonomy_id] => %d
            [parent] => %d
            [count] => %d
            [object_id] => %d
            [term_order] => %d
            [ID] => %d
            [comment_ID] => %d
            [comment_post_ID] => %d
            [comment_parent] => %d
            [user_id] => %d
            [link_id] => %d
            [link_owner] => %d
            [link_rating] => %d
            [option_id] => %d
            [blog_id] => %d
            [meta_id] => %d
            [post_id] => %d
            [user_status] => %d
            [umeta_id] => %d
            [comment_karma] => %d
            [comment_count] => %d
            [active] => %d
            [cat_id] => %d
            [deleted] => %d
            [lang_id] => %d
            [mature] => %d
            [public] => %d
            [site_id] => %d
            [spam] => %d
        )

    [charset] => utf8
    [collate] => 
    [dbuser:protected] => /* removed */
    [dbpassword:protected] => /* removed */
    [dbname:protected] => /* removed */
    [dbhost:protected] => /* removed */
    [dbh:protected] => Resource id #19
    [func_call] => $db->query("SELECT option_value FROM wp_options WHERE option_name = 'wpseo_internallinks' LIMIT 1")
    [is_mysql] => 1
    [base_prefix] => wp_
    [categories] => wp_categories
    [post2cat] => wp_post2cat
    [link2cat] => wp_link2cat
)
</pre><br />
<b>Fatal error</b>:  Cannot call overloaded function for non-object in <b>/home/davidbudd/public_html/wp-includes/class-wp.php</b> on line <b>532</b><br />