diff --git a/module/actor.js b/module/actor.js
index 3471922c..1fd83fca 100644
--- a/module/actor.js
+++ b/module/actor.js
@@ -492,7 +492,7 @@ export class RdDActor extends Actor {
     if ( data.value < 0 ) data.value = 0;
     
     if (name == "endurance") {
-      if ( inc < 0 ) // Each endurance lost -> fatigue lost
+      if ( sante.fatigue && inc < 0 ) // Each endurance lost -> fatigue lost
         sante.fatigue.value = sante.fatigue.value - inc
       
       // If endurance is 0 -> -1 vie