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 ('17578a03c42ebc7b2a62a9e32d15382b', -1, 1775291370, 1775291370, 'd849d86e', 16, 0, 0)

Line : 247
File : sessions.php