From d4bfee425a2a92cdf5dee90149d176e90bb0df1e Mon Sep 17 00:00:00 2001
From: Leo Horie <leohorie@hotmail.com>
Date: Wed, 31 Dec 2014 15:28:39 -0500
Subject: [PATCH] #388 throw error if no root element

---
 mithril.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mithril.js b/mithril.js
index 867d4ed7..8fd370a8 100644
--- a/mithril.js
+++ b/mithril.js
@@ -478,6 +478,7 @@ var m = (function app(window, undefined) {
 	var roots = [], modules = [], controllers = [], lastRedrawId = null, lastRedrawCallTime = 0, computePostRedrawHook = null, prevented = false, topModule;
 	var FRAME_BUDGET = 16; //60 frames per second = 1 call per 16 ms
 	m.module = function(root, module) {
+		if (!root) throw new Error("Please ensure the DOM element exists before rendering a template into it.");
 		var index = roots.indexOf(root);
 		if (index < 0) index = roots.length;
 		var isPrevented = false;