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 ('919862270dfbc685df46821368253424', -1, 1711708598, 1711708598, '2cdf2589', -4, 0, 0)

Line : 187
File : sessions.php