phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '3fffe3ec4bf14c78b97d70a9050a079d' 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 ('3fffe3ec4bf14c78b97d70a9050a079d', -1, 1770156508, 1770156508, 'd849d8a2', -4, 0, 0)

Line : 187
File : sessions.php