diff --git a/src/blackmisc/pq/physicalquantity.cpp b/src/blackmisc/pq/physicalquantity.cpp
index 77bf11f64..764646cdf 100644
--- a/src/blackmisc/pq/physicalquantity.cpp
+++ b/src/blackmisc/pq/physicalquantity.cpp
@@ -486,14 +486,6 @@ namespace BlackMisc
         template <class MU, class PQ>
         int CPhysicalQuantity<MU, PQ>::compareImpl(const PQ &a, const PQ &b)
         {
-            // fetch "null" as we do not know how expensive it is
-            const bool aIsNull = a.isNull();
-            const bool bIsNull = b.isNull();
-
-            if (aIsNull && bIsNull) { return 0; }
-            if (aIsNull > bIsNull)  { return -1; }
-            if (aIsNull < bIsNull)  { return 1; }
-
             if (a < b) { return -1; }
             else if (a > b) { return 1; }
             else { return 0; }