diff --git a/widget/src/windows/nsWindow.cpp b/widget/src/windows/nsWindow.cpp
index 11445530d62..94384b18a97 100644
--- a/widget/src/windows/nsWindow.cpp
+++ b/widget/src/windows/nsWindow.cpp
@@ -527,16 +527,14 @@ nsWindow::Create(nsIWidget *aParent,
                  nsIToolkit *aToolkit,
                  nsWidgetInitData *aInitData)
 {
-  nsWidgetInitData defaultInitData;
-  if (!aInitData)
-    aInitData = &defaultInitData;
+  if (aInitData)
+    mUnicodeWidget = aInitData->mUnicode;
 
-  mUnicodeWidget = aInitData->mUnicode;
-
-  nsIWidget *baseParent = aInitData->mWindowType == eWindowType_dialog ||
+  nsIWidget *baseParent = aInitData &&
+                         (aInitData->mWindowType == eWindowType_dialog ||
                           aInitData->mWindowType == eWindowType_toplevel ||
-                          aInitData->mWindowType == eWindowType_invisible ?
-                          nsnull : aParent;
+                          aInitData->mWindowType == eWindowType_invisible) ?
+                         nsnull : aParent;
 
   mIsTopWidgetWindow = (nsnull == baseParent);
   mBounds.width = aRect.width;
@@ -554,8 +552,11 @@ nsWindow::Create(nsIWidget *aParent,
     mParent = aNativeParent ? GetNSWindowPtr((HWND)aNativeParent) : nsnull;
   }
 
-  mPopupType = aInitData->mPopupHint;
-  mContentType = aInitData->mContentType;
+  if (nsnull != aInitData) {
+    mPopupType = aInitData->mPopupHint;
+  }
+
+  mContentType = aInitData ? aInitData->mContentType : eContentTypeInherit;
 
   DWORD style = WindowStyle();
   DWORD extendedStyle = WindowExStyle();
@@ -570,7 +571,7 @@ nsWindow::Create(nsIWidget *aParent,
   } else if (mWindowType == eWindowType_invisible) {
     // Make sure CreateWindowEx succeeds at creating a toplevel window
     style &= ~0x40000000; // WS_CHILDWINDOW
-  } else {
+  } else if (nsnull != aInitData) {
     // See if the caller wants to explictly set clip children and clip siblings
     if (aInitData->clipChildren) {
       style |= WS_CLIPCHILDREN;
@@ -583,7 +584,7 @@ nsWindow::Create(nsIWidget *aParent,
   }
 
   mWnd = ::CreateWindowExW(extendedStyle,
-                           aInitData->mDropShadow ?
+                           aInitData && aInitData->mDropShadow ?
                            WindowPopupClass() : WindowClass(),
                            L"",
                            style,