diff --git a/neutron/extensions/tagging.py b/neutron/extensions/tagging.py
index 36d48117919..6a130d94dcb 100644
--- a/neutron/extensions/tagging.py
+++ b/neutron/extensions/tagging.py
@@ -71,7 +71,7 @@ def validate_tag(tag):
 
 
 def validate_tags(body):
-    if 'tags' not in body:
+    if not isinstance(body, dict) or 'tags' not in body:
         raise exceptions.InvalidInput(error_message=_("Invalid tags body"))
     msg = validators.validate_list_of_unique_strings(body['tags'], MAX_TAG_LEN)
     if msg:
diff --git a/neutron/tests/unit/extensions/test_tag.py b/neutron/tests/unit/extensions/test_tag.py
index 359c38f1638..0db7736e98c 100644
--- a/neutron/tests/unit/extensions/test_tag.py
+++ b/neutron/tests/unit/extensions/test_tag.py
@@ -161,8 +161,13 @@ class TestTagApiBase(test_securitygroup.SecurityGroupsTestCase,
                         subresource='tags', sub_id=tag)
         return req.get_response(self.ext_api)
 
-    def _put_tags(self, tags):
-        body = {'tags': tags}
+    def _put_tags(self, tags=None, body=None):
+        if tags:
+            body = {'tags': tags}
+        elif body:
+            body = body
+        else:
+            body = {}
         req = self._req('PUT', self.collection, data=body, id=self.resource_id,
                         subresource='tags')
         return req.get_response(self.ext_api)
@@ -273,6 +278,14 @@ class TestResourceTagApi(TestTagApiBase):
         self._assertEqualTags(['red', 'green'], tags)
         self._test_notification_report(expect_notify)
 
+    def test_put_invalid_tags(self):
+        res = self._put_tags()
+        self.assertEqual(400, res.status_int)
+        res = self._put_tags(body=7)
+        self.assertEqual(400, res.status_int)
+        res = self._put_tags(body={'invalid': True})
+        self.assertEqual(400, res.status_int)
+
     def test_put_tags_replace(self):
         res = self._put_tags(['red', 'green'])
         self.assertEqual(200, res.status_int)