diff --git a/js/geolocation.js b/js/geolocation.js
index 5413de1..ef5366b 100644
--- a/js/geolocation.js
+++ b/js/geolocation.js
@@ -80,7 +80,7 @@ function showManualLocationInput(callback) {
   const parsedLat = parseFloat(lat);
   const parsedLon = parseFloat(lon);
 
-  if (isNaN(parsedLat) || isNaN(parsedLon)) {
+  if (Number.isNaN(parsedLat) || Number.isNaN(parsedLon)) {
     alert("❌ Invalid coordinates. Please enter valid numbers.");
     showManualLocationInput(callback);
     return;
diff --git a/js/invoice.js b/js/invoice.js
index 162fdc1..f14bed8 100644
--- a/js/invoice.js
+++ b/js/invoice.js
@@ -24,7 +24,7 @@ window.invoiceGenerator = (() => {
   // Retrieve order details from localStorage
   function getOrderById(orderId) {
     try {
-      const orders = JSON.parse(localStorage.getItem('chaatOrders')) || [];
+      const orders = (JSON.parse(localStorage.getItem('chaatOrders') ?? "null") ?? null) || [];
       return orders.find(o => o.id === orderId);
     } catch (error) {
       console.error("Error loading order for invoice:", error);
@@ -268,7 +268,7 @@ window.invoiceGenerator = (() => {
       `;
     });
 
-    printContainer.innerHTML = `
+    printContainer.textContent = `
       <div class="print-receipt-box">
         <div class="receipt-header">
           <h1>CHAATBAZAR</h1>
diff --git a/js/recommendations.js b/js/recommendations.js
index ad32cfe..f0f7266 100644
--- a/js/recommendations.js
+++ b/js/recommendations.js
@@ -1,7 +1,7 @@
 /// ===== SMART RECOMMENDATION ENGINE =====
 
 // Load cart from localStorage
-let cart = JSON.parse(localStorage.getItem("chaatCart")) || [];
+let cart = (() => { try { return (JSON.parse(localStorage.getItem("chaatCart") ?? "null") ?? null) } catch { return null } })() || [];
 
 // ===== FOOD PAIRINGS =====