diff --git a/people/views.py b/people/views.py
index b7afa7dc..827fac41 100644
--- a/people/views.py
+++ b/people/views.py
@@ -291,9 +291,9 @@ def value_repr(self):
                                         value=max_mission_per_month_qs["id__count"],
                                         link=max_mission_per_month_link))
 
-    max_monthly_daily_rate = FinancialCondition.objects.filter(mission__lead__state="WON", consultant=consultant).annotate(
-        month=TruncMonth("mission__timesheet__working_date")).values("month").annotate(Avg("daily_rate")).order_by(
-        "-daily_rate__avg").first()
+    max_monthly_daily_rate = FinancialCondition.objects.filter(mission__lead__state="WON", consultant=consultant) \
+        .exclude(mission__timesheet__working_date=None).annotate(month=TruncMonth("mission__timesheet__working_date")) \
+        .values("month").annotate(Avg("daily_rate")).order_by("-daily_rate__avg").first()
     if max_monthly_daily_rate:
         achievements.append(Achievement(key="MAX_MONTHLY_DAILY_RATE",
                                         name=_("Max monthly daily rate (%s)") % max_monthly_daily_rate["month"].strftime("%m/%Y"),