diff --git a/src/sentry/tasks/store.py b/src/sentry/tasks/store.py
index 4e7b341a32336f..ecb760d193b74e 100644
--- a/src/sentry/tasks/store.py
+++ b/src/sentry/tasks/store.py
@@ -287,7 +287,11 @@ def save_event(cache_key=None, data=None, start_time=None, event_id=None, **kwar
                 'description': exc.message,
             }
         )
-        tsdb.incr(tsdb.models.project_total_received_discarded, project, timestamp=start_time)
+        tsdb.incr(
+            tsdb.models.project_total_received_discarded,
+            project,
+            timestamp=to_datetime(start_time) if start_time is not None else None,
+        )
     finally:
         if cache_key:
             default_cache.delete(cache_key)
diff --git a/tests/sentry/tasks/test_store.py b/tests/sentry/tasks/test_store.py
index 5c7eae33005214..13e9c0a8ae6ee6 100644
--- a/tests/sentry/tasks/test_store.py
+++ b/tests/sentry/tasks/test_store.py
@@ -1,10 +1,15 @@
 from __future__ import absolute_import
 
 import mock
+import uuid
+from time import time
 
+from sentry import tsdb
+from sentry.event_manager import EventManager, HashDiscarded
 from sentry.plugins import Plugin2
-from sentry.tasks.store import preprocess_event, process_event
+from sentry.tasks.store import preprocess_event, process_event, save_event
 from sentry.testutils import PluginTestCase
+from sentry.utils.dates import to_datetime
 
 
 class BasicPreprocessorPlugin(Plugin2):
@@ -164,3 +169,28 @@ def test_process_event_unprocessed(self, mock_default_cache, mock_save_event):
         mock_save_event.delay.assert_called_once_with(
             cache_key='e:1', data=None, start_time=1, event_id=None
         )
+
+    @mock.patch.object(tsdb, 'incr')
+    def test_hash_discarded_raised(self, mock_incr):
+        project = self.create_project()
+
+        data = {
+            'project': project.id,
+            'platform': 'NOTMATTLANG',
+            'message': 'test',
+            'event_id': uuid.uuid4().hex,
+            'extra': {
+                'foo': 'bar'
+            },
+        }
+
+        now = time()
+        mock_save = mock.Mock()
+        mock_save.side_effect = HashDiscarded
+        with mock.patch.object(EventManager, 'save', mock_save):
+            save_event(data=data, start_time=now)
+            mock_incr.assert_called_with(
+                tsdb.models.project_total_received_discarded,
+                project.id,
+                timestamp=to_datetime(now),
+            )