phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '8398f4b3c80b53755d6c6fa4fdb18eb3' 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 ('8398f4b3c80b53755d6c6fa4fdb18eb3', -1, 1762130370, 1762130370, 'd849d8a1', -4, 0, 0)

Line : 187
File : sessions.php