diff --git a/module/rolldata-ajustements.js b/module/rolldata-ajustements.js
index d1c6692a..67dd2c78 100644
--- a/module/rolldata-ajustements.js
+++ b/module/rolldata-ajustements.js
@@ -94,10 +94,10 @@ export const referenceAjustements = {
     getDescr: (rollData, actor) => rollData.diviseurSignificative > 1 ? `Facteur significative <span class="rdd-diviseur">&times;${Misc.getFractionHtml(rollData.diviseurSignificative)}</span>` : ''
   },
   isEcaille: {
-    isVisible: (rollData, actor) => rollData.arme && rollData.arme.data.magique && Number(rollData.arme.data.ecaille_efficacite) > 0,
-    isUsed: (rollData, actor) => rollData.arme && rollData.arme.data.magique && Number(rollData.arme.data.ecaille_efficacite) > 0,
+    isVisible: (rollData, actor) => rollData.arme?.data.magique && Number(rollData.arme?.data.ecaille_efficacite) > 0,
+    isUsed: (rollData, actor) => rollData.arme?.data.magique && Number(rollData.arme?.data.ecaille_efficacite) > 0,
     getLabel: (rollData, actor) => "Ecaille d'Efficacité: ",
-    getValue: (rollData, actor) => (rollData.arme && rollData.arme.data.magique && Number(rollData.arme.data.ecaille_efficacite) > 0) ? rollData.arme.data.ecaille_efficacite : 0,
+    getValue: (rollData, actor) => (rollData.arme?.data.magique && Number(rollData.arme.data.ecaille_efficacite) > 0) ? rollData.arme.data.ecaille_efficacite : 0,
   },
   finesse: {
     isUsed: (rollData, actor) => RdDBonus.isDefenseAttaqueFinesse(rollData),