diff --git a/src/GeoJson/GeoJson.php b/src/GeoJson/GeoJson.php
index ba4997b..91a4768 100644
--- a/src/GeoJson/GeoJson.php
+++ b/src/GeoJson/GeoJson.php
@@ -130,23 +130,27 @@ final public static function jsonUnserialize($json)
                 break;
 
             case 'FeatureCollection':
-                $features = isset($json['features']) ? $json['features'] : array();
+                if ( ! $json->offsetExists('features')) {
+                    throw UnserializationException::missingProperty($type, 'features', 'array');
+                }
 
-                if ( ! is_array($features)) {
-                    throw UnserializationException::invalidProperty($type, 'features', $features, 'array');
+                if ( ! is_array($json['features'])) {
+                    throw UnserializationException::invalidProperty($type, 'features', $json['features'], 'array');
                 }
 
-                $args[] = array_map(array('self', 'jsonUnserialize'), $features);
+                $args[] = array_map(array('self', 'jsonUnserialize'), $json['features']);
                 break;
 
             case 'GeometryCollection':
-                $geometries = isset($json['geometries']) ? $json['geometries'] : array();
+                if ( ! $json->offsetExists('geometries')) {
+                    throw UnserializationException::missingProperty($type, 'geometries', 'array');
+                }
 
-                if ( ! is_array($geometries)) {
-                    throw UnserializationException::invalidProperty($type, 'geometries', $geometries, 'array');
+                if ( ! is_array($json['geometries'])) {
+                    throw UnserializationException::invalidProperty($type, 'geometries', $json['geometries'], 'array');
                 }
 
-                $args[] = array_map(array('self', 'jsonUnserialize'), $geometries);
+                $args[] = array_map(array('self', 'jsonUnserialize'), $json['geometries']);
                 break;
 
             default:
diff --git a/tests/GeoJson/Tests/Feature/FeatureCollectionTest.php b/tests/GeoJson/Tests/Feature/FeatureCollectionTest.php
index db655f7..2531301 100644
--- a/tests/GeoJson/Tests/Feature/FeatureCollectionTest.php
+++ b/tests/GeoJson/Tests/Feature/FeatureCollectionTest.php
@@ -148,4 +148,22 @@ public function provideJsonDecodeAssocOptions()
             'assoc=false' => array(false),
         );
     }
+
+    /**
+     * @expectedException GeoJson\Exception\UnserializationException
+     * @expectedExceptionMessage FeatureCollection expected "features" property of type array, none given
+     */
+    public function testUnserializationShouldRequireFeaturesProperty()
+    {
+        GeoJson::jsonUnserialize(array('type' => 'FeatureCollection'));
+    }
+
+    /**
+     * @expectedException GeoJson\Exception\UnserializationException
+     * @expectedExceptionMessage FeatureCollection expected "features" property of type array
+     */
+    public function testUnserializationShouldRequireFeaturesArray()
+    {
+        GeoJson::jsonUnserialize(array('type' => 'FeatureCollection', 'features' => null));
+    }
 }
diff --git a/tests/GeoJson/Tests/Geometry/GeometryCollectionTest.php b/tests/GeoJson/Tests/Geometry/GeometryCollectionTest.php
index 7701eeb..701e4f1 100644
--- a/tests/GeoJson/Tests/Geometry/GeometryCollectionTest.php
+++ b/tests/GeoJson/Tests/Geometry/GeometryCollectionTest.php
@@ -136,4 +136,22 @@ public function provideJsonDecodeAssocOptions()
             'assoc=false' => array(false),
         );
     }
+
+    /**
+     * @expectedException GeoJson\Exception\UnserializationException
+     * @expectedExceptionMessage GeometryCollection expected "geometries" property of type array, none given
+     */
+    public function testUnserializationShouldRequireGeometriesProperty()
+    {
+        GeoJson::jsonUnserialize(array('type' => 'GeometryCollection'));
+    }
+
+    /**
+     * @expectedException GeoJson\Exception\UnserializationException
+     * @expectedExceptionMessage GeometryCollection expected "geometries" property of type array
+     */
+    public function testUnserializationShouldRequireGeometriesArray()
+    {
+        GeoJson::jsonUnserialize(array('type' => 'GeometryCollection', 'geometries' => null));
+    }
 }