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 ('b9f9a29e7437f1b1dd2b8d3701f6b9eb', -1, 1711628303, 1711628303, '2cd432dc', -10, 0, 0)

Line : 187
File : sessions.php