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 ('746428a0fe74f73ca531f8fc3e81d4bf', -1, 1490343077, 1490343077, '36a3a893', -10, 0, 0)

Line : 187
File : sessions.php