phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'd8d4d68bac209d53ec019ef2f3a11cef' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('d8d4d68bac209d53ec019ef2f3a11cef', -1, 1770006062, 1770006062, 'd849d837', -9, 0, 0)

Line : 187
File : sessions.php