phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'af51771d15521eac2c9b945a27d620ef' 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 ('af51771d15521eac2c9b945a27d620ef', -1, 1770562319, 1770562319, 'd849d876', 5, 0, 0)

Line : 187
File : sessions.php