phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('61d449fb0b12b4b2d3ac8152c913ac91', -1, 1728480181, 1728480181, '03ee524d', 0, 0, 0)

Line : 172
File : sessions.php