diff --git a/aircox/management/commands/diffusions.py b/aircox/management/commands/diffusions.py
index b5a2cea..9196d8b 100755
--- a/aircox/management/commands/diffusions.py
+++ b/aircox/management/commands/diffusions.py
@@ -29,9 +29,10 @@ class Actions:
         for schedule in Schedule.objects.filter(program__active=True,
                                                 initial__isnull=True):
             eps, diffs = schedule.diffusions_of_month(self.date)
-
-            episodes += eps
-            diffusions += diffs
+            if eps:
+                episodes += eps
+            if diffs:
+                diffusions += diffs
 
             logger.info('[update] %s: %d episodes, %d diffusions and reruns',
                         str(schedule), len(eps), len(diffs))
diff --git a/aircox/models/program.py b/aircox/models/program.py
index 4406d34..0efc2e5 100644
--- a/aircox/models/program.py
+++ b/aircox/models/program.py
@@ -400,7 +400,7 @@ class Schedule(BaseRerun):
         from .episode import Diffusion, Episode
         if self.initial is not None or \
                 self.frequency == Schedule.Frequency.ponctual:
-            return []
+            return [], []
 
         # dates for self and reruns as (date, initial)
         reruns = [(rerun, rerun.date - self.date)