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 ('80aad8f7d8c424680c301e1107a68dea', -1, 1766680865, 1766680865, 'd849d83c', 2, 0, 0)

Line : 187
File : sessions.php