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 ('7bb99b353135176c830a77effae5ebeb', -1, 1780634419, 1780634419, 'd849d8ce', 3, 0, 0)

Line : 189
File : sessions.php