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 ('4e4eafcd7d3e1c5c65bf735e23bb6c71', -1, 1714610015, 1714610015, '03907ce8', 1, 0, 0)

Line : 187
File : sessions.php