Index: tests/Zend/Service/Yahoo/OfflineTest.php
===================================================================
--- tests/Zend/Service/Yahoo/OfflineTest.php	(revision 12417)
+++ tests/Zend/Service/Yahoo/OfflineTest.php	(working copy)
@@ -47,6 +47,10 @@
  */
 require_once 'Zend/Http/Client/Adapter/Test.php';
 
+/**
+ * @see Zend_Service_Yahoo_WebResult
+ */
+require_once 'Zend/Service/Yahoo/WebResult.php';
 
 /**
  * @category   Zend
@@ -531,6 +535,19 @@
             $this->assertContains("option 'type'", $e->getMessage());
         }
     }
+    
+    /**
+     * WebResult should check if the result has a Cache section or not
+     * 
+     * @group ZF-3636
+     */
+    public function testWebResultCache(){
+    	// create empty result eg. without cache section
+    	$domDoc = new DOMDocument();
+    	$element = $domDoc->createElement('Result'); 
+    	// this should not result in errors    	
+    	$webResult = new Zend_Service_Yahoo_WebResult($element);
+    }
 }
 
 
Index: library/Zend/Service/Yahoo/WebResult.php
===================================================================
--- library/Zend/Service/Yahoo/WebResult.php	(revision 12417)
+++ library/Zend/Service/Yahoo/WebResult.php	(working copy)
@@ -93,8 +93,17 @@
 
         $this->_xpath = new DOMXPath($result->ownerDocument);
         $this->_xpath->registerNamespace('yh', $this->_namespace);
-
-        $this->CacheUrl = $this->_xpath->query('./yh:Cache/yh:Url/text()', $result)->item(0)->data;
-        $this->CacheSize = (int) $this->_xpath->query('./yh:Cache/yh:Size/text()', $result)->item(0)->data;
+		
+        // check if the cache section exists
+        $cacheUrl = $this->_xpath->query('./yh:Cache/yh:Url/text()', $result)->item(0);
+        if ($cacheUrl instanceof DOMNode)
+        {
+        	$this->CacheUrl = $cacheUrl->data;
+        }
+        $cacheSize = $this->_xpath->query('./yh:Cache/yh:Size/text()', $result)->item(0);
+        if ($cacheSize instanceof DOMNode)
+        {
+        	$this->CacheSize = (int) $cacheSize->data;
+        }
     }
 }