phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 2

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('42d6dae81480f748c2329c2c87860d6e', -1, 1505924474, 1505924474, '369c45cc', -11, 0, 0)

Line : 187
File : sessions.php