Nginx PageSpeed DO droplet would not reboot with pagespeedadmin.conf

I haven't determined why, but one of my DO droplet that is running Centmin Mod rebooted tonight and was tripping up on the pagespeedadmin.conf file.

Code:

nginx: [emerg] unknown directive "pagespeed" in /usr/local/nginx/conf/pagespeedadmin.conf:5
nginx: configuration file /usr/local/nginx/conf/nginx.conf test failed

I commented out this line in nginx.conf and everything is working better now but I can't figure out how this was triggered or what the issue is or how my other droplets running Centmin Mod may be affected.

Code:

#include /usr/local/nginx/conf/pagespeedadmin.conf;

Any insights into what's going on here?

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Thanks in advance!