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 ('6f2c809d1065b43e41fcdcbbee48d9b7', -1, 1711668705, 1711668705, '365711b1', -10, 0, 0)

Line : 187
File : sessions.php