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 ('c4f764d31c8e5f0d3e884473b3998097', -1, 1713912694, 1713912694, '0395d620', 5, 0, 0)

Line : 187
File : sessions.php