diff --git a/content/base/crashtests/646184.html b/content/base/crashtests/646184.html
deleted file mode 100644
index ef34d41a64bc..000000000000
--- a/content/base/crashtests/646184.html
+++ /dev/null
@@ -1,17 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<script>
-
-function boom()
-{
-  var f = document.getElementById("f");
-  var w = f.contentWindow;
-  f.parentNode.removeChild(f);
-  w.localStorage;
-}
-
-</script>
-</head>
-<body onload="boom();"><iframe id="f" src="data:text/html,1"></iframe></body>
-</html>
diff --git a/content/base/crashtests/crashtests.list b/content/base/crashtests/crashtests.list
index 8ef191b605d8..c06123c42cfb 100644
--- a/content/base/crashtests/crashtests.list
+++ b/content/base/crashtests/crashtests.list
@@ -88,4 +88,3 @@ load 604262-1.html
 load 628599-1.html
 load 637214-1.svg
 load 637214-2.svg
-load 646184.html
diff --git a/dom/base/nsGlobalWindow.cpp b/dom/base/nsGlobalWindow.cpp
index 31d53795aca7..9cbc9f783e2d 100644
--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -7951,9 +7951,7 @@ nsGlobalWindow::GetSessionStorage(nsIDOMStorage ** aSessionStorage)
     *aSessionStorage = nsnull;
 
     nsString documentURI;
-    if (mDocument) {
-      mDocument->GetDocumentURI(documentURI);
-    }
+    mDocument->GetDocumentURI(documentURI);
 
     nsresult rv = docShell->GetSessionStorageForPrincipal(principal,
                                                           documentURI,
@@ -8037,9 +8035,7 @@ nsGlobalWindow::GetLocalStorage(nsIDOMStorage ** aLocalStorage)
     NS_ENSURE_SUCCESS(rv, rv);
 
     nsString documentURI;
-    if (mDocument) {
-      mDocument->GetDocumentURI(documentURI);
-    }
+    mDocument->GetDocumentURI(documentURI);
 
     rv = storageManager->GetLocalStorageForPrincipal(principal,
                                                      documentURI,
