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 ('24e6b694e2e047a1580b9c16b796b81f', -1, 1711642420, 1711642420, '03ee3e7c', 5, 0, 0)

Line : 187
File : sessions.php