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 ('a7f3acb57bd4994a8b6131bb344f259e', -1, 1766680807, 1766680807, 'd849d83c', 2, 0, 0)

Line : 187
File : sessions.php