phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'af8792c9374ce44ef460ad117697b4bf' for key 1

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('af8792c9374ce44ef460ad117697b4bf', -1, 1419235523, 1419235523, '36a65452', 6, 0, 0)

Line : 187
File : sessions.php