diff --git a/backend/src/main/java/ca/bc/gov/backendstartapi/dto/PtValsCalReqDto.java b/backend/src/main/java/ca/bc/gov/backendstartapi/dto/PtValsCalReqDto.java
index 94cff9744..6d22d0a4a 100644
--- a/backend/src/main/java/ca/bc/gov/backendstartapi/dto/PtValsCalReqDto.java
+++ b/backend/src/main/java/ca/bc/gov/backendstartapi/dto/PtValsCalReqDto.java
@@ -13,4 +13,4 @@ public record PtValsCalReqDto(
     @NotNull List<OrchardParentTreeValsDto> orchardPtVals,
     @NotNull List<GeospatialRequestDto> smpMixIdAndProps,
     @NotNull Integer smpParentsOutside,
-    @NotNull BigDecimal contaminantPollenBv) {}
+    BigDecimal contaminantPollenBv) {}
diff --git a/backend/src/main/java/ca/bc/gov/backendstartapi/service/ParentTreeService.java b/backend/src/main/java/ca/bc/gov/backendstartapi/service/ParentTreeService.java
index 1a05562c3..400d110e8 100644
--- a/backend/src/main/java/ca/bc/gov/backendstartapi/service/ParentTreeService.java
+++ b/backend/src/main/java/ca/bc/gov/backendstartapi/service/ParentTreeService.java
@@ -203,7 +203,12 @@ public PtCalculationResDto calculatePtVals(PtValsCalReqDto ptVals) {
     Integer totalNonOrchardPollen = 0;
     Integer numNonOrchardPollen = 0;
 
-    SparLog.debug("ptVals.contaminantPollenBv(): {}", ptVals.contaminantPollenBv());
+    double contaminantPollenBvDouble = 0;
+    if (ValueUtil.hasValue(ptVals.contaminantPollenBv())) {
+      contaminantPollenBvDouble = ptVals.contaminantPollenBv().doubleValue();
+    }
+
+    SparLog.debug("contaminantPollenBvDouble: {}", contaminantPollenBvDouble);
 
     // --Third pass to calc values that depend on totals derived above and the remainder
     for (OrchardParentTreeValsDto parentTreeRow : ptVals.orchardPtVals()) {
@@ -257,7 +262,7 @@ public PtCalculationResDto calculatePtVals(PtValsCalReqDto ptVals) {
 
         // --col:AA
         double vmContamContrib =
-            (auxValueAa * ptVals.contaminantPollenBv().doubleValue()) * femaleCropPop.doubleValue();
+            (auxValueAa * contaminantPollenBvDouble) * femaleCropPop.doubleValue();
 
         // --col:AB (depends on SUM(X)=v_sum_m_gw_contrib_orch_poll)
         double auxValueAb =