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 ('e720c3e8400d36b8ee584f2ce18b1b6f', -1, 1714152016, 1714152016, '03131f49', -4, 0, 0)

Line : 187
File : sessions.php