phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '8a30c9c213b6da8f7fde5fb364823536' for key 1

INSERT INTO sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('8a30c9c213b6da8f7fde5fb364823536', -1, 1246739970, 1246739970, '26673f39', 12, 0, 0)

Line : 187
File : sessions.php