phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '9a8a4b9f3ec49eed8d9e4c4c68044ec7' 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 ('9a8a4b9f3ec49eed8d9e4c4c68044ec7', -1, 1770973244, 1770973244, 'd849d809', -4, 0, 0)

Line : 187
File : sessions.php