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 ('a5af1120617d38f94d6c1d7445e910c9', -1, 1713604535, 1713604535, '1275bc40', 2, 0, 0)

Line : 187
File : sessions.php