diff --git a/1.4/Assemblies/RJW_Menstruation.dll b/1.4/Assemblies/RJW_Menstruation.dll
index 0fea093..1eb0643 100644
Binary files a/1.4/Assemblies/RJW_Menstruation.dll and b/1.4/Assemblies/RJW_Menstruation.dll differ
diff --git a/1.4/source/RJW_Menstruation/RJW_Menstruation/Patch/Biotech_Patch.cs b/1.4/source/RJW_Menstruation/RJW_Menstruation/Patch/Biotech_Patch.cs
index c60d3b4..fa6a512 100644
--- a/1.4/source/RJW_Menstruation/RJW_Menstruation/Patch/Biotech_Patch.cs
+++ b/1.4/source/RJW_Menstruation/RJW_Menstruation/Patch/Biotech_Patch.cs
@@ -4,6 +4,8 @@ using RimWorld;
 using Verse;
 using System.Collections.Generic;
 using System.Reflection;
+using System;
+using System.Reflection.Emit;
 
 namespace RJW_Menstruation
 {
@@ -120,9 +122,22 @@ namespace RJW_Menstruation
         }
     }
 
-    [HarmonyPatch(typeof(PregnancyUtility), nameof(PregnancyUtility.TryTerminatePregnancy))]
-    public class TryTerminatePregnancy_Patch
+    [HarmonyDebug]
+    [HarmonyPatch]
+    public class TerminatePregnancy_Patch
     {
+        public static IEnumerable<MethodBase> TargetMethods()
+        {
+            yield return AccessTools.Method(typeof(PregnancyUtility), nameof(PregnancyUtility.TryTerminatePregnancy));
+            yield return AccessTools.Method(typeof(Recipe_TerminatePregnancy), nameof(Recipe_TerminatePregnancy.ApplyOnPawn));
+        }
+
+        private static PregnancyAttitude? GetAttitude(Hediff pregnancy)
+        {
+            if (pregnancy is Hediff_Pregnant preg) return preg.Attitude;
+            else return null;
+        }
+
         private static Hediff GetEarliestPregnancy(Pawn pawn)
         {
             Hediff Earliest_Pregnancy = PregnancyUtility.GetPregnancyHediff(pawn);
@@ -136,20 +151,30 @@ namespace RJW_Menstruation
             return Earliest_Pregnancy;
         }
 
-        private static readonly MethodInfo GetPregnancyHediff = AccessTools.Method(typeof(PregnancyUtility), nameof(PregnancyUtility.GetPregnancyHediff), new System.Type[] { typeof(Pawn) });
+        private static readonly MethodInfo GetPregnancyHediff = AccessTools.Method(typeof(PregnancyUtility), nameof(PregnancyUtility.GetPregnancyHediff), new Type[] { typeof(Pawn) });
+        private static readonly MethodInfo Get_Attitude = AccessTools.DeclaredPropertyGetter(typeof(Hediff_Pregnant), nameof(Hediff_Pregnant.Attitude));
 
-        // Also called for Recipe_TerminatePregnancy.ApplyOnPawn
         public static IEnumerable<CodeInstruction> Transpiler(IEnumerable<CodeInstruction> instructions)
         {
-            if (GetPregnancyHediff == null || GetPregnancyHediff.ReturnType != typeof(Hediff)) throw new System.InvalidOperationException("GetPregnancyHediff not found");
+            if (GetPregnancyHediff == null || GetPregnancyHediff.ReturnType != typeof(Hediff)) throw new InvalidOperationException("GetPregnancyHediff not found");
+            if (Get_Attitude == null || Nullable.GetUnderlyingType(Get_Attitude.ReturnType) != typeof(PregnancyAttitude)) throw new InvalidOperationException("get_Attitude not found");
             foreach (CodeInstruction instruction in instructions)
             {
                 if (instruction.Calls(GetPregnancyHediff))
-                    yield return CodeInstruction.Call(typeof(TryTerminatePregnancy_Patch), nameof(TryTerminatePregnancy_Patch.GetEarliestPregnancy));
+                    yield return CodeInstruction.Call(typeof(TerminatePregnancy_Patch), nameof(TerminatePregnancy_Patch.GetEarliestPregnancy));
+                // Menstruation pregnancies don't have an attitude, so skip the cast to Hediff_Pregnant and call a version that handles it
+                else if (instruction.opcode == OpCodes.Castclass && (Type)instruction.operand == typeof(Hediff_Pregnant))
+                    yield return new CodeInstruction(OpCodes.Nop);
+                else if (instruction.Calls(Get_Attitude))
+                    yield return CodeInstruction.Call(typeof(TerminatePregnancy_Patch), nameof(TerminatePregnancy_Patch.GetAttitude));
                 else yield return instruction;
             }
         }
+    }
 
+    [HarmonyPatch(typeof(PregnancyUtility), nameof(PregnancyUtility.TryTerminatePregnancy))]
+    public class PregnancyUtility_TryTerminatePregnancy_Patch
+    {
         public static void Postfix(bool __result, Pawn pawn)
         {
             if (__result)
@@ -168,15 +193,6 @@ namespace RJW_Menstruation
         }
     }
 
-    [HarmonyPatch(typeof(Recipe_TerminatePregnancy), nameof(Recipe_TerminatePregnancy.ApplyOnPawn))]
-    public class TerminatePregnancy_ApplyOnPawn_Patch
-    {
-        public static IEnumerable<CodeInstruction> Transpiler(IEnumerable<CodeInstruction> instructions)
-        {
-            return TryTerminatePregnancy_Patch.Transpiler(instructions);
-        }
-    }
-
     [HarmonyPatch(typeof(Pawn_GeneTracker), "Notify_GenesChanged")]
     public class Notify_GenesChanged_Patch
     {
diff --git a/changelogs.txt b/changelogs.txt
index 263dbc4..fc1e583 100644
--- a/changelogs.txt
+++ b/changelogs.txt
@@ -1,5 +1,6 @@
 Version 1.0.8.6
  - Updated Traditional Chinese translation by Hydrogen.
+ - Fix error when trying to terminate a non-Biotech pregnancy.
  - Added several menstruation-related genes.
  - Added experimental support for twins and hybrids with Biotech pregnancies, disabled by default.