diff --git a/module/rdd-utility.js b/module/rdd-utility.js
index 6cff6c32..41f0d635 100644
--- a/module/rdd-utility.js
+++ b/module/rdd-utility.js
@@ -539,7 +539,10 @@ 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) {