Some mods break SkinColor to the point that even trying to access it throws a null ref, so go work around that

1.4/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Breast.cs

@@ -356,7 +356,7 @@ namespace RJW_Menstruation
         {
             baseAreola = Mathf.Clamp01(baseAreola + amount);
             UpdateNipples();
-        }
+        }     
 
         public void UpdateNipples()
         {
@@ -365,7 +365,7 @@ namespace RJW_Menstruation
             cachedNipple = baseNipple + nippleProgress * nippleChange;
 
             // For some reason, Props can go null when RJW relocates the chest (e.g. some animals), so catch that
-            cachedColor = Colors.CMYKLerp(Pawn.story?.SkinColor ?? Color.white, (Props?.BlackNippleColor ?? CompProperties_Breast.DefaultBlacknippleColor.ToColor), Alpha);
+            cachedColor = Colors.CMYKLerp(Utility.SafeSkinColor(Pawn), (Props?.BlackNippleColor ?? CompProperties_Breast.DefaultBlacknippleColor.ToColor), Alpha);
         }
 
         public void CopyBreastProperties(HediffComp_Breast original)

1.4/source/RJW_Menstruation/RJW_Menstruation/Patch/Biotech_Patch.cs

@@ -192,6 +192,20 @@ namespace RJW_Menstruation
         }
     }
 
+    [HarmonyPatch(typeof(Pawn_GeneTracker), "AddGene", new Type[] {typeof(Gene), typeof(bool)})]
+    public class AddGene_Patch
+    {
+        public static bool Prefix(ref Gene __result, Gene gene, Pawn ___pawn)
+        {
+            if(VariousDefOf.WombGenes.Contains(gene.def) && !___pawn.GetMenstruationComps().Any())
+            {
+                __result = null;
+                return false;
+            }
+            else return true;
+        }
+    }
+
     [HarmonyPatch(typeof(Pawn_GeneTracker), "Notify_GenesChanged")]
     public class Notify_GenesChanged_Patch
     {

1.4/source/RJW_Menstruation/RJW_Menstruation/UI/Dialog_WombStatus.cs

@@ -394,7 +394,7 @@ namespace RJW_Menstruation
             anal = pawn.GetAnalIcon(showOrigin);
             GUI.color = new Color(1.00f, 0.47f, 0.47f, 1);
             GUI.Box(rect, "", boxstyle);
-            GUI.color = pawn.story.SkinColor;
+            GUI.color = Utility.SafeSkinColor(pawn);
             //Widgets.DrawTextureFitted(genitalIconRect, anal, 1.0f);
             //Widgets.DrawTextureFitted(genitalIconRect, vagina, 1.0f);
             GUI.DrawTexture(genitalIconRect, anal, ScaleMode.ScaleToFit);

1.4/source/RJW_Menstruation/RJW_Menstruation/Utility.cs

@@ -209,7 +209,7 @@ namespace RJW_Menstruation
                     nipple = ContentFinder<Texture2D>.Get("Breasts/Breast_Breast00_Nipple00", false);
                     areola = ContentFinder<Texture2D>.Get("Breasts/Breast_Breast00_Areola00", false);
 
-                    GUI.color = pawn.story?.SkinColor ?? Color.white;
+                    GUI.color = SafeSkinColor(pawn);
                     GUI.DrawTexture(rect, breast, ScaleMode.ScaleToFit);
                     GUI.color = Color.white;
                     GUI.DrawTexture(rect, areola, ScaleMode.ScaleToFit);
@@ -236,7 +236,7 @@ namespace RJW_Menstruation
                 breast = ContentFinder<Texture2D>.Get(icon, false);
                 areola = ContentFinder<Texture2D>.Get(areolaicon, false);
                 nipple = ContentFinder<Texture2D>.Get(nippleicon, false);
-                GUI.color = pawn.story.SkinColor;
+                GUI.color = SafeSkinColor(pawn);
                 GUI.DrawTexture(rect, breast, ScaleMode.ScaleToFit);
 
                 GUI.color = comp.NippleColor;
@@ -255,7 +255,7 @@ namespace RJW_Menstruation
                 nipple = ContentFinder<Texture2D>.Get("Breasts/Breast_Breast00_Nipple00", false);
                 areola = ContentFinder<Texture2D>.Get("Breasts/Breast_Breast00_Areola00", false);
 
-                GUI.color = pawn.story.SkinColor;
+                GUI.color = SafeSkinColor(pawn);
                 GUI.DrawTexture(rect, breast, ScaleMode.ScaleToFit);
                 GUI.color = Color.white;
                 GUI.DrawTexture(rect, areola, ScaleMode.ScaleToFit);
@@ -454,5 +454,18 @@ namespace RJW_Menstruation
             if (pawn.IsAnimal() && !Configurations.EnableAnimalCycle) return false;
             return true;
         }
+
+        // Apparently with some mods, even doing pawn.story?.SkinColor can throw a null reference, so we're stuck doing this
+        public static Color SafeSkinColor(Pawn pawn)
+        {
+            try
+            {
+                return pawn.story?.SkinColor ?? Color.white;
+            }
+            catch (NullReferenceException)
+            {
+                return Color.white;
+            }
+        }
     }
 }

1.4/source/RJW_Menstruation/RJW_Menstruation/VariousDefOf.cs

@@ -53,6 +53,16 @@ namespace RJW_Menstruation
         public static readonly GeneDef QuadOvulation = DefDatabase<GeneDef>.GetNamed("Menstruation_QuadOvulation");
         public static readonly GeneDef NoBleeding = DefDatabase<GeneDef>.GetNamed("Menstruation_NoBleeding");
 
+        public static readonly HashSet<GeneDef> WombGenes = new HashSet<GeneDef>() {
+            ShortEggLifetime,
+            DoubleEggLifetime,
+            QuadEggLifetime,
+            NeverEstrus,
+            FullEstrus,
+            DoubleOvulation,
+            QuadOvulation,
+            NoBleeding };
+
         private static List<ThingDef> allraces = null;
         private static List<PawnKindDef> allkinds = null;
         private static HashSet<HediffDef> allvaginas = null;