From 2fcdb0f70079c3338ebc5df8ef3aae53a54b6f43 Mon Sep 17 00:00:00 2001
From: Wesley Wigham <t-weswig@microsoft.com>
Date: Wed, 21 Oct 2015 15:53:59 -0700
Subject: [PATCH] bit more cleanup

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

diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index 1e95c827221..0f0cdc0e110 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -6794,6 +6794,9 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                     specifier = (declaration as ImportDeclaration|ExportDeclaration).moduleSpecifier;
                 }
                 let moduleSymbol = resolver.getSymbolAtLocation(specifier);
+                if (!moduleSymbol) {
+                    return;    
+                }
                 let moduleDeclaration = getDeclarationOfKind(moduleSymbol, SyntaxKind.SourceFile) as SourceFile;
                 if (!moduleDeclaration || isDeclarationFile(moduleDeclaration)) {
                     return;