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 a7b8720..e7c91dc 100644
--- a/1.4/source/RJW_Menstruation/RJW_Menstruation/Hediff_MultiplePregnancy.cs
+++ b/1.4/source/RJW_Menstruation/RJW_Menstruation/Hediff_MultiplePregnancy.cs
@@ -457,7 +457,7 @@ namespace RJW_Menstruation
                     }
                     else
                     {
-                        enzygoticSiblings?.Add(baby, firstbaby);
+                        enzygoticSiblings.Add(baby, firstbaby);
 
                         if (baby.story != null)
                         {