From a13cacdde9186a7eed31c21060db31e2c0ba54cb Mon Sep 17 00:00:00 2001
From: euzuro <euzuro@metacarta.com>
Date: Wed, 21 Nov 2007 18:50:55 +0000
Subject: [PATCH] protect stopObserving() from trying to remove nonexistant
 events. thx for review, cr5 (Closes #1151)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@5241 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
---
 lib/OpenLayers/Events.js | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/lib/OpenLayers/Events.js b/lib/OpenLayers/Events.js
index ee33c933ea..4214a95c20 100644
--- a/lib/OpenLayers/Events.js
+++ b/lib/OpenLayers/Events.js
@@ -295,10 +295,12 @@ OpenLayers.Event = {
         }
     
         //actually remove the event listener from browser
-        if (element.removeEventListener) {
-            element.removeEventListener(name, observer, useCapture);
-        } else if (element && element.detachEvent) {
-            element.detachEvent('on' + name, observer);
+        if (foundEntry) {
+            if (element.removeEventListener) {
+                element.removeEventListener(name, observer, useCapture);
+            } else if (element && element.detachEvent) {
+                element.detachEvent('on' + name, observer);
+            }
         }
         return foundEntry;
     },