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 ('2124f4ee82fd128d9f763a74f6a77d57', -1, 1711717779, 1711717779, '6b1589b8', -4, 0, 0)

Line : 187
File : sessions.php