diff --git a/src/Google/Model.php b/src/Google/Model.php
index d5d25e3c1..2b6e67ad5 100644
--- a/src/Google/Model.php
+++ b/src/Google/Model.php
@@ -113,23 +113,42 @@ public function toSimpleObject()
     $props = $reflect->getProperties(ReflectionProperty::IS_PUBLIC);
     foreach ($props as $member) {
       $name = $member->getName();
-      if ($this->$name instanceof Google_Model) {
-        $object->$name = $this->$name->toSimpleObject();
-      } else if ($this->$name !== null) {
-        $object->$name = $this->$name;
+      $result = $this->getSimpleValue($this->$name);
+      if ($result != null) {
+        $object->$name = $result;
       }
     }
 
     // Process all other data.
     foreach ($this->data as $key => $val) {
-      if ($val instanceof Google_Model) {
-        $object->$key = $val->toSimpleObject();
-      } else if ($val !== null) {
-        $object->$key = $val;
+      $result = $this->getSimpleValue($val);
+      if ($result != null) {
+        $object->$key = $result;
       }
     }
     return $object;
   }
+  
+  /**
+   * Handle different types of values, primarily
+   * other objects and map and array data types.
+   */
+  private function getSimpleValue($value)
+  {
+    if ($value instanceof Google_Model) {
+      return $value->toSimpleObject();
+    } else if (is_array($value)) {
+      $return = array();
+      foreach ($value as $key => $a_value) {
+        $a_value = $this->getSimpleValue($a_value);
+        if ($a_value != null) {
+          $return[$key] = $a_value;
+        }
+      }
+      return $return;
+    }
+    return $value;
+  }
 
   /**
    * Returns true only if the array is associative.
diff --git a/tests/general/ApiModelTest.php b/tests/general/ApiModelTest.php
index 740afaaaa..a7514f620 100644
--- a/tests/general/ApiModelTest.php
+++ b/tests/general/ApiModelTest.php
@@ -28,11 +28,18 @@ public function testJsonStructure() {
     $model2->publicC = 12345;
     $model2->publicD = null;
     $model->publicB = $model2;
+    $model3 = new Google_Model();
+    $model3->publicE = 54321;
+    $model3->publicF = null;
+    $model->publicG = array($model3, "hello");
     $string = json_encode($model->toSimpleObject());
     $data = json_decode($string, true);
     $this->assertEquals(12345, $data['publicB']['publicC']);
     $this->assertEquals("This is a string", $data['publicA']);
     $this->assertArrayNotHasKey("publicD", $data['publicB']);
+    $this->assertArrayHasKey("publicE", $data['publicG'][0]);
+    $this->assertArrayNotHasKey("publicF", $data['publicG'][0]);
+    $this->assertEquals("hello", $data['publicG'][1]);
     $this->assertArrayNotHasKey("data", $data);
   }
 }
diff --git a/tests/youtube/YouTubeTest.php b/tests/youtube/YouTubeTest.php
index 5d4239e1c..747548771 100644
--- a/tests/youtube/YouTubeTest.php
+++ b/tests/youtube/YouTubeTest.php
@@ -72,5 +72,13 @@ public function testMissingFieldsAreNull() {
     $simpleManual = $o_channel->toSimpleObject();
     $this->assertObjectHasAttribute('timeLinked', $simpleManual->contentOwnerDetails);    
     $this->assertObjectNotHasAttribute('contentOwner', $simpleManual->contentOwnerDetails);
+  
+    $ping = new Google_Service_YouTube_ChannelConversionPing();
+    $ping->setContext("hello");
+    $pings = new Google_Service_YouTube_ChannelConversionPings();
+    $pings->setPings(array($ping));
+    $simplePings = $pings->toSimpleObject();
+    $this->assertObjectHasAttribute('context', $simplePings->pings[0]);    
+    $this->assertObjectNotHasAttribute('conversionUrl', $simplePings->pings[0]);    
   }
-}
+}
\ No newline at end of file