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 ('08a8cb574ddc0b6d2b661c391b5d8b65', -1, 1713974438, 1713974438, '031196a3', 7, 0, 0)

Line : 187
File : sessions.php