phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'df9393b6b84e9b1b5de2ed0758399e81' 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 ('df9393b6b84e9b1b5de2ed0758399e81', -1, 1768589273, 1768589273, 'd849d87e', -4, 0, 0)

Line : 187
File : sessions.php