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 ('376de5376fba49d37d3636ca62a9a879', -1, 1709024791, 1709024791, '2cd24d49', -1, 0, 0)

Line : 187
File : sessions.php