phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'dffba3544e56703df9645275552d9f3e' 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 ('dffba3544e56703df9645275552d9f3e', -1, 1763818890, 1763818890, 'd849d859', -4, 0, 0)

Line : 187
File : sessions.php