I got this SAME error today. Only I got it on my shopping cart page. Of course I get it the day the site is supposed to launch…
Everything was fine then I updated to Jetpack 2.6 then the error. Saw this post and saw that Jetpack was updated to 2.7 so tried that. Nope!
I disabled Jetpack and it clears it right up. I’m going to be submitting a bug report. I don’t think there’s a way to get around it on our end.