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 ('3fe2a3b42cbca1e2739cb2ecf68e45f7', -1, 1730418247, 1730418247, '1277c06e', 15, 0, 0)

Line : 195
File : sessions.php