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 ('2b5d61b8450bbfba5a1623b05d5af7c1', -1, 1756422762, 1756422762, 'd849d87f', -9, 0, 0)

Line : 187
File : sessions.php