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 ('fb2c28e85997519ba1baf034b2d8e4df', -1, 1711657895, 1711657895, '2cc81785', -8, 0, 0)

Line : 187
File : sessions.php