diff --git a/.claude/settings.local.json b/.claude/settings.local.json
index 584ca81..0dafd3b 100644
--- a/.claude/settings.local.json
+++ b/.claude/settings.local.json
@@ -68,7 +68,8 @@
       "Bash(git commit -m 'Fix: Handle designJson as string in checkout API *)",
       "Bash(git commit -m 'Fix: Use personalised price in design approval cart add *)",
       "Bash(git commit -m 'Fix: Safely access designJson properties in admin orders page *)",
-      "Bash(git commit -m 'Fix: Show personalised price on design review page *)"
+      "Bash(git commit -m 'Fix: Show personalised price on design review page *)",
+      "Bash(git commit -m 'Fix: Safely parse designJson in admin order detail page *)"
     ]
   }
 }
diff --git a/src/app/admin/orders/[id]/page.tsx b/src/app/admin/orders/[id]/page.tsx
index c2100d6..f37eadc 100644
--- a/src/app/admin/orders/[id]/page.tsx
+++ b/src/app/admin/orders/[id]/page.tsx
@@ -78,9 +78,15 @@ export default async function OrderDetailPage({ params }: { params: { id: string
 
       <div className="mt-10 divide-y divide-line border-t border-line">
         {order.items.map((item) => {
-          const design = JSON.parse(item.designJson) as { front: unknown[]; back: unknown[] };
-          const hasFrontDesign = design.front.length > 0;
-          const hasBackDesign = design.back.length > 0;
+          let hasFrontDesign = false;
+          let hasBackDesign = false;
+          try {
+            const design = JSON.parse(item.designJson) as { front: unknown[]; back: unknown[] };
+            hasFrontDesign = (design.front?.length ?? 0) > 0;
+            hasBackDesign = (design.back?.length ?? 0) > 0;
+          } catch {
+            // If parsing fails, assume no custom design
+          }
           const frontPlacement = item.placementPreviewUrl || item.designPreviewUrl;
           return (
             <div key={item.id} className="py-8">