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 ('5538e81d78f923ff4d82f7c77b924780', -1, 1714068754, 1714068754, '038597c7', -4, 0, 0)

Line : 187
File : sessions.php