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 ('ab0c965b0613516745883a876fbceaa0', -1, 1730419853, 1730419853, '1276a65e', -9, 0, 0)

Line : 195
File : sessions.php