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 ('c38c1f4a4d7369aa6be76c64b3f3d2e8', -1, 1711718444, 1711718444, 'ae81be0a', -1, 0, 0)

Line : 187
File : sessions.php