phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO forum_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('982d748eedb8b3b5e9e27db33b481e59', -1, 1540289172, 1540289172, '36a174e1', -4, 0, 0)

Line : 187
File : sessions.php