This plugin makes my site blank!

I have nginx 1.10.1, varnish cache for front end, redis for db cache. When I installed this plugin, configured it for paged cache only. Then I clear cache, and every time I first visit my homepage or any url on my site. It’s just a blank page. Only when I press the F5 key to refresh, then it will show my content again. This is the reason when I use google pagespeed insights for test, It tells me that my site is blank.

Besides that, this plugin is a fast cache plugin. It has many tools and features. I hope he could complete it more. Then this will be great.

I may switch back to my super cache plugin because of this black error page.