Issue with FreeRadius filling up root

Hello Guys, Radius is generating NULL file under / and it keep growing , seems like accounting logs. Can somebody help me know how can I disable it as it is filling up root space over server. # ls -l /NULL -rw-r--r-- 1 root root 672768 Jul 12 08:26 /NULL We are using freeradius version “3.0.11-2” Any help or suggestion will be highly appreciated. Thanks & Regards, Nitin Sharma