From f97397b67c639ee21c32363864b584f20dfa8ce2 Mon Sep 17 00:00:00 2001
From: "hyatt%netscape.com" <hyatt%netscape.com>
Date: Fri, 18 Feb 2000 10:22:20 +0000
Subject: [PATCH] Adding guards. Harmless.

---
 layout/xul/base/src/nsMenuPopupFrame.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/layout/xul/base/src/nsMenuPopupFrame.cpp b/layout/xul/base/src/nsMenuPopupFrame.cpp
index 258012d723a3..1c8c5fe0f49b 100644
--- a/layout/xul/base/src/nsMenuPopupFrame.cpp
+++ b/layout/xul/base/src/nsMenuPopupFrame.cpp
@@ -914,6 +914,9 @@ nsMenuPopupFrame::CreateDismissalListener()
 NS_IMETHODIMP
 nsMenuPopupFrame::InstallKeyboardNavigator()
 {
+  if (mKeyboardNavigator)
+    return NS_OK;
+
   nsCOMPtr<nsIDocument> doc;
   mContent->GetDocument(*getter_AddRefs(doc));
   nsCOMPtr<nsIDOMEventReceiver> target = do_QueryInterface(doc);
@@ -932,6 +935,9 @@ nsMenuPopupFrame::InstallKeyboardNavigator()
 NS_IMETHODIMP
 nsMenuPopupFrame::RemoveKeyboardNavigator()
 {
+  if (!mKeyboardNavigator)
+    return NS_OK;
+
   mTarget->RemoveEventListener("keypress", (nsIDOMKeyListener*)mKeyboardNavigator, PR_TRUE);
   mTarget->RemoveEventListener("keydown", (nsIDOMKeyListener*)mKeyboardNavigator, PR_TRUE);
   mTarget->RemoveEventListener("keyup", (nsIDOMKeyListener*)mKeyboardNavigator, PR_TRUE);