Debug Warning Database error

I’m getting this when logged in.

Warning: Undefined property: stdClass::$avatar_url in public_html/wp-content/plugins/wise-chat/src/dao/user/WiseChatUsersDAO.php on line 314
WordPress database error: [Unknown column 'avatar_url' in 'field list']
UPDATE <code>0bb_wise_chat_users</code> SET <code>name</code> = 'MBV', <code>session_id</code> = 'lDEojXBPHjFQ', <code>avatar_url</code> = NULL, <code>data</code> = '[]', <code>ip</code> = '183.137.6.173', <code>wp_id</code> = '3' WHERE <code>id</code> = 5341

WordPress database error: [Unknown column 'avatar_url' in 'field list']
UPDATE <code>0bb_wise_chat_users</code> SET <code>name</code> = 'MVB', <code>session_id</code> = 'lDEojXBPHjFQ', <code>avatar_url</code> = NULL, <code>data</code> = '[]', <code>ip</code> = '183.137.6.173', <code>wp_id</code> = '3' WHERE <code>id</code> = 5341