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 ('9b537751c91e7eb986539a8c39f08e15', -1, 1713893601, 1713893601, '0389b9b4', 6, 0, 0)

Line : 187
File : sessions.php