From 5ee5ae11f99a8830af6fb4a94aca7f8ef2f68b94 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <drosen@microsoft.com>
Date: Thu, 25 Jun 2015 16:09:59 -0400
Subject: [PATCH] Check for definedness on the pattern's type.

---
 src/compiler/checker.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 763e4173287..64155fe7737 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -12362,7 +12362,8 @@ namespace ts {
                         node.parent.parent.kind === SyntaxKind.ObjectBindingPattern &&
                         node === (<BindingElement>node.parent).propertyName) {
                     let typeOfPattern = getTypeAtLocation(node.parent.parent);
-                    let propertyDeclaration = getPropertyOfType(typeOfPattern, (<Identifier>node).text);
+                    let propertyDeclaration = typeOfPattern && getPropertyOfType(typeOfPattern, (<Identifier>node).text);
+
                     if (propertyDeclaration) {
                         return propertyDeclaration;
                     }