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 ('b724a9bc9d1a10d38b2fb70ef1e7ad3c', -1, 1711645538, 1711645538, '03ee4fa9', 2, 0, 0)

Line : 187
File : sessions.php