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 ('f6c12288d9f4461187cd17954d4ecb05', -1, 1711633624, 1711633624, '03ee3e7c', -4, 0, 0)

Line : 187
File : sessions.php