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 ('9086b1051f753bcf7cae191686d20f67', -1, 1752904076, 1752904076, 'd849d88f', 7, 0, 0)

Line : 189
File : sessions.php