diff --git a/1.4/Assemblies/RJW_Menstruation.dll b/1.4/Assemblies/RJW_Menstruation.dll
index 668607d..1e66766 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/Things.cs b/1.4/source/RJW_Menstruation/RJW_Menstruation/Things.cs
index 1213ee0..c95454a 100644
--- a/1.4/source/RJW_Menstruation/RJW_Menstruation/Things.cs
+++ b/1.4/source/RJW_Menstruation/RJW_Menstruation/Things.cs
@@ -272,7 +272,7 @@ namespace RJW_Menstruation
         public override void DirtyEffect(int tickInterval)
         {
 
-            if (wearTicks > MinHrstoDirtyEffect * GenDate.TicksPerHour && Rand.MTBEventOccurs(100.0f, GenDate.TicksPerHour, tickInterval) && !Wearer.apparel.IsLocked(this))
+            if (wearTicks > MinHrstoDirtyEffect * GenDate.TicksPerHour && Rand.MTBEventOccurs(100.0f, GenDate.TicksPerHour, tickInterval) && !(Wearer.apparel?.IsLocked(this) ?? false))
             {
                 Wearer.health.AddHediff(HediffDefOf.WoundInfection, Genital_Helper.get_genitalsBPR(Wearer));
             }