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 ('91fa3ab2bbe45b0f64d58e8e7d0dffbd', -1, 1714023756, 1714023756, '038a7ac3', -4, 0, 0)

Line : 187
File : sessions.php