phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'af9fefc51db2213705285bd20cf07f5a' 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 ('af9fefc51db2213705285bd20cf07f5a', -1, 1770354568, 1770354568, 'd849d87c', -9, 0, 0)

Line : 187
File : sessions.php