Error message

• Notice: Undefined index: taxonomy_term in custom_title_node_view() (line 10 of /var/www/web/sites/all/modules/custom_title/custom_title.module).
• Notice: Trying to get property 'tid' of non-object in custom_title_node_view() (line 10 of /var/www/web/sites/all/modules/custom_title/custom_title.module).