phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a88403cf22c1212304c109c0a860c81e' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('a88403cf22c1212304c109c0a860c81e', -1, 1766112012, 1766112012, 'd849d857', -2, 0, 0)

Line : 187
File : sessions.php