phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6fbad8eec3bb1ac89c435678cb2d7df6' for key 'PRIMARY'

INSERT INTO aafbbs_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('6fbad8eec3bb1ac89c435678cb2d7df6', -1, 1508647946, 1508647946, '36a6cb4c', -4, 0, 0)

Line : 187
File : sessions.php