nginx : [emerg] invalid number of arguments in "fastcgi_buffers" directive

I was following the steps mentioned here https://github.com/vanilla/vanilla-docker. 
After I ran the command: docker-compose up --build,  the build stopped with the following error.

nginx  | nginx: [emerg] invalid number of arguments in "fastcgi_buffers" directive in /etc/nginx/fastcgi.conf:37
nginx exited with code 1

Can anyone from the team help me to resolve this issue?
