diff --git a/app/tools.py b/app/tools.py
index 08771b5..90a1cb2 100644
--- a/app/tools.py
+++ b/app/tools.py
@@ -38,7 +38,9 @@ class ConsumableStats:
             for pitstop in pitstops:
                 self.overall_amount += pitstop.amount
                 self.amounts.append(StatsEvent(pitstop.date, pitstop.amount))
-                self.price.append(StatsEvent(pitstop.date, pitstop.costs/pitstop.amount))
+                # some pitstops seem to have lost their costs...
+                if pitstop.costs:                
+                    self.price.append(StatsEvent(pitstop.date, pitstop.costs/pitstop.amount))
             self.average_amount_fuelled = self.overall_amount / pitstop_count
         if pitstop_count > 1:
             overall_distance = (