diff --git a/src/Services/PricedetailHelper.php b/src/Services/PricedetailHelper.php
index d36ce4d7..c4a24a6b 100644
--- a/src/Services/PricedetailHelper.php
+++ b/src/Services/PricedetailHelper.php
@@ -174,8 +174,12 @@ class PricedetailHelper
                 continue;
             }
 
-            $avg = bcadd($avg, $this->convertMoneyToCurrency($pricedetail->getPricePerUnit(), $pricedetail->getCurrency(), $currency), Pricedetail::PRICE_PRECISION);
-            ++$count;
+            $converted = $this->convertMoneyToCurrency($pricedetail->getPricePerUnit(), $pricedetail->getCurrency(), $currency);
+            //Ignore price informations that can not be converted to base currency.
+            if ($converted !== null) {
+                $avg = bcadd($avg, $converted, Pricedetail::PRICE_PRECISION);
+                ++$count;
+            }
         }
 
         if (0 === $count) {