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 ('84503f7b510ee56b1b2db9727b2f7396', -1, 1714018678, 1714018678, '0d3a2717', -7, 0, 0)

Line : 187
File : sessions.php