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 ('047ba1936caf85b4b811fc024e6a21ba', -1, 1713974594, 1713974594, '12e1d15f', -4, 0, 0)

Line : 187
File : sessions.php