diff --git a/module/item-sort.js b/module/item-sort.js
index 6bff1c59..1ebf950b 100644
--- a/module/item-sort.js
+++ b/module/item-sort.js
@@ -114,7 +114,7 @@ export class RdDItemSort extends Item {
     let bonusCaseList = this.buildBonusCaseList(sort.data.bonuscase, false);
     for( let bc of bonusCaseList) {
       if (bc.case == coordTMR) { // Case existante
-        return bc.bonus;
+        return Number(bc.bonus);
       }
     }
     return 0;
diff --git a/module/rdd-resolution-table.js b/module/rdd-resolution-table.js
index 16c2a806..395b3659 100644
--- a/module/rdd-resolution-table.js
+++ b/module/rdd-resolution-table.js
@@ -134,7 +134,7 @@ export class RdDResolutionTable {
   /* -------------------------------------------- */
   static _updateChancesWithBonus(chances, bonus) {
     if (bonus) {
-      let newScore = chances.score + bonus;
+      let newScore = Number(chances.score) + bonus;
       mergeObject(chances, this._computeCell(null, newScore), { overwrite: true });
     }
   }