diff --git a/components/admin/PrizeManagement.tsx b/components/admin/PrizeManagement.tsx
index e240b60..636fd8e 100644
--- a/components/admin/PrizeManagement.tsx
+++ b/components/admin/PrizeManagement.tsx
@@ -94,8 +94,8 @@ export default function PrizeManagement() {
 
   // Calculer les stats
   const prizeStats = useMemo(() => {
-    const totalStock = prizes.reduce((acc, p) => acc + (p.initialStock || p.stock || 0), 0);
-    const totalUsed = prizes.reduce((acc, p) => acc + (p.ticketsUsed || 0), 0);
+    const totalStock = prizes.reduce((acc, p) => acc + Number(p.initialStock || p.stock || 0), 0);
+    const totalUsed = prizes.reduce((acc, p) => acc + Number(p.ticketsUsed || 0), 0);
     const activeCount = prizes.filter(p => p.isActive).length;
     return { totalStock, totalUsed, activeCount, totalPrizes: prizes.length };
   }, [prizes]);
@@ -195,7 +195,7 @@ export default function PrizeManagement() {
           {prizes.map((prize) => {
             const style = getPrizeStyle(prize.type);
             const IconComponent = style.icon;
-            const stockRemaining = (prize.initialStock || 0) - (prize.ticketsUsed || 0);
+            const stockRemaining = Number(prize.initialStock || 0) - Number(prize.ticketsUsed || 0);
 
             return (
               <div