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 ('40a79671b323284e4ce391b3d86a5e90', -1, 1713496876, 1713496876, '1276a662', -2, 0, 0)

Line : 187
File : sessions.php