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 ('18aa0cc4283338b5d2bd1dca7058171a', -1, 1711640280, 1711640280, '2cc81785', 0, 0, 0)

Line : 187
File : sessions.php