From c3c88c73b36f945f97016a999147ba84902f809c Mon Sep 17 00:00:00 2001
From: Jakub Jankiewicz <jcubic@onet.pl>
Date: Sat, 14 Jan 2017 22:20:29 +0100
Subject: [PATCH] Fix sveltejs/svelte#249

---
 src/generators/dom/visitors/attributes/binding/index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/generators/dom/visitors/attributes/binding/index.js b/src/generators/dom/visitors/attributes/binding/index.js
index a546d2fa970a..5c5f15f72939 100644
--- a/src/generators/dom/visitors/attributes/binding/index.js
+++ b/src/generators/dom/visitors/attributes/binding/index.js
@@ -102,7 +102,7 @@ export default function createBinding ( generator, node, attribute, current, loc
 			}
 		` );
 	} else {
-		const updateElement = `${local.name}.${attribute.name} = ${contextual ? attribute.value : `root.${attribute.value}`}`;
+		const updateElement = `${local.name}.${attribute.name} = ${contextual ? attribute.value : `typeof root.${attribute.value} == 'undefined' ? '' : root.${attribute.value}`}`;
 
 		generator.uses.addEventListener = true;
 		generator.uses.removeEventListener = true;