Database Error while previewing job post.

http://prntscr.com/mhy5ml
WordPress database error: [Column ‘post_content’ cannot be null]
INSERT INTO wp_nxla_posts (post_author, post_date, post_date_gmt, post_content, post_content_filtered, post_title, post_excerpt, post_status, post_type, comment_status, ping_status, post_password, post_name, to_ping, pinged, post_modified, post_modified_gmt, post_parent, menu_order, post_mime_type, guid) VALUES (4, ‘2019-02-07 09:37:46’, ‘2019-02-07 13:37:46’, NULL, ”, ”, ”, ‘preview’, ‘job_listing’, ‘closed’, ‘closed’, ”, ‘test’, ”, ”, ‘2019-02-07 09:37:46’, ‘2019-02-07 13:37:46’, 0, 0, ”, ”)