diff --git a/module/rdd-utility.js b/module/rdd-utility.js
index 34573582..8764eb4d 100644
--- a/module/rdd-utility.js
+++ b/module/rdd-utility.js
@@ -553,7 +553,10 @@ export class RdDUtility {
     // Gestion du bouton payer
     html.on("click", '#payer-button', event => {
       let sumdenier = event.currentTarget.attributes['data-somme-denier'].value;
-      let quantite = event.currentTarget.attributes['data-quantite'].value;
+      let quantite = 1;
+      if ( event.currentTarget.attributes['data-quantite'] ) {
+        quantite = event.currentTarget.attributes['data-quantite'].value;
+      }
       let jsondata = event.currentTarget.attributes['data-jsondata']
       let objData
       if (jsondata) {
diff --git a/system.json b/system.json
index 2d5bb8e4..d003b074 100644
--- a/system.json
+++ b/system.json
@@ -2,7 +2,7 @@
   "name": "foundryvtt-reve-de-dragon",
   "title": "Rêve de Dragon",
   "description": "Rêve de Dragon RPG for FoundryVTT",
-  "version": "1.3.39",
+  "version": "1.3.40",
   "manifestPlusVersion": "1.0.0",
   "minimumCoreVersion": "0.7.5",
   "compatibleCoreVersion": "0.7.9",