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 ('a1775540e6224e6875cc1e53f8e23112', -1, 1713921621, 1713921621, '0390e996', -4, 0, 0)

Line : 187
File : sessions.php