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 ('50bb543f7997cc43d3fe1d7747823c21', -1, 1711658953, 1711658953, '03ef3957', -2, 0, 0)

Line : 187
File : sessions.php