diff --git a/ceilometer/network/statistics/__init__.py b/ceilometer/network/statistics/__init__.py
index 29df6e993..d3afe737c 100644
--- a/ceilometer/network/statistics/__init__.py
+++ b/ceilometer/network/statistics/__init__.py
@@ -71,7 +71,8 @@ class _Base(plugin.CentralPollster):
                                               parse_url,
                                               params,
                                               cache)
-            for data in sample_data:
+
+            for data in sample_data or []:
                 if data is None:
                     continue
                 if not isinstance(data, list):
diff --git a/ceilometer/tests/network/statistics/test_statistics.py b/ceilometer/tests/network/statistics/test_statistics.py
index 5656290cb..df258f1e8 100644
--- a/ceilometer/tests/network/statistics/test_statistics.py
+++ b/ceilometer/tests/network/statistics/test_statistics.py
@@ -175,3 +175,13 @@ class TestBaseGetSamples(test.BaseTestCase):
         samples = self._get_samples('http://foo')
 
         self.assertEqual(len(samples), 0)
+
+    def test_get_samples_return_no_generator(self):
+        class NoneFakeDriver(driver.Driver):
+
+            def get_sample_data(self, meter_name, parse_url, params, cache):
+                return None
+
+        self._setup_ext_mgr(http=NoneFakeDriver())
+        samples = self._get_samples('http://foo')
+        self.assertFalse(samples)