phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '16b64a5c1ce64f6aec617215291cd96c' 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 ('16b64a5c1ce64f6aec617215291cd96c', -1, 1770161771, 1770161771, 'd849d8a2', -4, 0, 0)

Line : 187
File : sessions.php