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 ('83ba8a651398a2c90070b8ec69719677', -1, 1539683601, 1539683601, '369ed0bd', -11, 0, 0)

Line : 187
File : sessions.php