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 ('c75a56bbe20dc936dcaf075f2447d0d7', -1, 1714041115, 1714041115, '0391cea9', 6, 0, 0)

Line : 187
File : sessions.php