Validate the DOM node passed to render

render/render.js

@@ -515,6 +515,7 @@ module.exports = function($window) {
 	}
 
 	function render(dom, vnodes) {
+		if (!dom) throw new Error("Ensure the DOM element being passed to m.route/m.mount/m.render is not undefined.")
 		var hooks = []
 		var active = $doc.activeElement
 

render/tests/test-render.js

@@ -21,4 +21,13 @@ o.spec("render", function() {
 
 		o(root.childNodes.length).equals(0)
 	})
+	o("throws on invalid root node", function(){
+		var threw = false
+		try {
+			render(null, [])
+		} catch (e) {
+			threw = true
+		}
+		o(threw).equals(true)
+	})
 })