From 65431a963beb14529d3b8ba705cbdd1f706f0c07 Mon Sep 17 00:00:00 2001
From: Mohamed Hegazy <mhegazy@microsoft.com>
Date: Wed, 25 Feb 2015 13:54:09 -0800
Subject: [PATCH] Check if the module exist before extracting exports from it

---
 src/compiler/checker.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index c807406d534..dc9f5d07b2d 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -751,7 +751,10 @@ module ts {
                     forEach(symbol.declarations, node => {
                         if (node.kind === SyntaxKind.SourceFile || node.kind === SyntaxKind.ModuleDeclaration) {
                             forEach((<ExportContainer>node).exportStars, exportStar => {
-                                visit(resolveExternalModuleName(exportStar, exportStar.moduleSpecifier));
+                                var moduleSymbol = resolveExternalModuleName(exportStar, exportStar.moduleSpecifier);
+                                if (moduleSymbol) {
+                                    visit(moduleSymbol);
+                                }
                             });
                         }
                     });