diff --git a/1.4/source/RJW_Menstruation/RJW_Menstruation/Hediff_MultiplePregnancy.cs b/1.4/source/RJW_Menstruation/RJW_Menstruation/Hediff_MultiplePregnancy.cs
index 1142ff4..a52ca13 100644
--- a/1.4/source/RJW_Menstruation/RJW_Menstruation/Hediff_MultiplePregnancy.cs
+++ b/1.4/source/RJW_Menstruation/RJW_Menstruation/Hediff_MultiplePregnancy.cs
@@ -444,9 +444,10 @@ namespace RJW_Menstruation
                             baby.genes.xenotypeName = mother.genes.xenotypeName;
                             baby.genes.iconDef = mother.genes.iconDef;
                         }
-                        if (baby.genes != null)
+                        if (baby.genes != null && ModsConfig.BiotechActive)
                         {
-                            baby.genes.SetXenotypeDirect(BabyXenoTypeDecider(mother, father, out bool hybridBaby));
+                            XenotypeDef xenoTypeDef = BabyXenoTypeDecider(mother, father, out bool hybridBaby);
+                            if (xenoTypeDef != null) baby.genes.SetXenotypeDirect(xenoTypeDef);
                             if(hybridBaby)
                             {
                                 baby.genes.hybrid = true;
@@ -465,7 +466,7 @@ namespace RJW_Menstruation
                             baby.story.bodyType = firstbaby.story.bodyType;
                         }
 
-                        if (baby.genes != null)
+                        if (baby.genes != null && ModsConfig.BiotechActive)
                         {
                             baby.genes.SetXenotypeDirect(firstbaby.genes.Xenotype);
                             baby.genes.xenotypeName = firstbaby.genes.xenotypeName;