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 ('ecb4df4b1f0b9ca4c4b8c7b90a623f6a', -1, 1713954358, 1713954358, '12db16a9', 2, 0, 0)

Line : 187
File : sessions.php