diff --git a/pinax/notifications/engine.py b/pinax/notifications/engine.py
index 61cffc89..4f0bf525 100644
--- a/pinax/notifications/engine.py
+++ b/pinax/notifications/engine.py
@@ -37,6 +37,9 @@ def acquire_lock(*args):
 
 def send_all(*args):
     lock = acquire_lock(*args)
+    if lock is None:
+        logging.debug("no lock acquired. skipping sending.")
+        return
     batches, sent, sent_actual = 0, 0, 0
     start_time = time.time()
 
diff --git a/pinax/notifications/tests/tests.py b/pinax/notifications/tests/tests.py
deleted file mode 100644
index 4eda25be..00000000
--- a/pinax/notifications/tests/tests.py
+++ /dev/null
@@ -1,7 +0,0 @@
-from django.test import TestCase
-
-
-class Tests(TestCase):
-
-    def setUp(self):
-        pass