phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'cd6acdcda1c0c63a7b39a88f7bbbaeaf' 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 ('cd6acdcda1c0c63a7b39a88f7bbbaeaf', -1, 1770855621, 1770855621, 'd849d876', 1, 0, 0)

Line : 187
File : sessions.php