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 ('d67974ac2d65b8758818b67c20a857f3', -1, 1714008033, 1714008033, '0381171e', -10, 0, 0)

Line : 187
File : sessions.php