phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '9c4865848b7537f1ff7957dd5d14024b' 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 ('9c4865848b7537f1ff7957dd5d14024b', -1, 1770120196, 1770120196, 'd849d8b9', 3, 0, 0)

Line : 187
File : sessions.php