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 ('f26b6a3b719ea28580f66cbb5fa3ddb8', -1, 1713617717, 1713617717, '0d3aa846', -4, 0, 0)

Line : 187
File : sessions.php