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 ('9c62c2e551d356056bbca2a4c778d5b6', -1, 1711710597, 1711710597, '36a68d34', -4, 0, 0)

Line : 187
File : sessions.php