I fixed it locally by doing this:

@@ -112,18 +112,22 @@
                };

                // Add it to the body to get the computed style
-               document.body.insertBefore(el, null);
-
-               for(var t in transforms){
-                   if( el.style[t] !== undefined ){
-                       el.style[t] = 'translate3d(1px,1px,1px)';
-                       supported = window.getComputedStyle(el).getPropertyValue(transforms[t]);
-                   }
-               }
+               if (document.body !== null) {
+                       document.body.insertBefore(el, null);
+
+                       for(var t in transforms){
+                           if( el.style[t] !== undefined ){
+                               el.style[t] = 'translate3d(1px,1px,1px)';
+                               supported = window.getComputedStyle(el).getPropertyValue(transforms[t]);
+                           }
+                       }

-               document.body.removeChild(el);
+                       document.body.removeChild(el);

-               return (supported !== undefined && supported.length > 0 && supported !== "none");
+                       return (supported !== undefined && supported.length > 0 && supported !== "none");
+               } else {
+                       return false;
+               }
        })();

        if(cssTransforms3d){

I'll be happy to submit a PR for this, but I'd like the author to comment so I can know if it's a proper fix in his eyes.

Uncaught TypeError: Cannot read property 'insertBefore' of null #88

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