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 ('d67066499a7479cec9d5936cc2d8891a', -1, 1713544414, 1713544414, '12761ff7', -7, 0, 0)

Line : 187
File : sessions.php