title: Unknown column 'add_new_page' in 'where clause'
body: <p>After installing the wordpress plugin <strong>Learnpress</strong> on my wordpress theme i got an error like 
  <strong>WordPress database error: [Unknown column 'add_new_page' in 'where clause'] 
  SELECT * FROM wp_posts WHERE 1 AND ID IN(add_new_page,124,112,add_new_page) AND post_status &lt;> 'trash'</strong>
  Can anybody help me throuth this issue .</p>