phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '4f8bf7c9b2998e9fd09f986aad70980f' 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 ('4f8bf7c9b2998e9fd09f986aad70980f', -1, 1764118184, 1764118184, 'd849d81d', -4, 0, 0)

Line : 187
File : sessions.php