phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c0bf20712711bb35f7c20a988a64cb8f' 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 ('c0bf20712711bb35f7c20a988a64cb8f', -1, 1770675005, 1770675005, 'd849d821', 2, 0, 0)

Line : 187
File : sessions.php