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 ('d288b1bb4b8f35d62ecf1b293e554412', -1, 1490448914, 1490448914, '36c54a89', 12, 0, 0)

Line : 187
File : sessions.php