fix: Add null checks to prevent 'Cannot read properties of null' errors

components/dashboard/Countries.tsx

@@ -7,7 +7,7 @@ interface CountriesProps {
 }
 
 export default function Countries({ countries }: CountriesProps) {
-  if (countries.length === 0) {
+  if (!countries || countries.length === 0) {
     return (
       <div className="bg-white dark:bg-neutral-900 border border-neutral-200 dark:border-neutral-800 rounded-xl p-6">
         <h3 className="text-lg font-semibold mb-4 text-neutral-900 dark:text-white">

components/dashboard/TopPages.tsx

@@ -7,7 +7,7 @@ interface TopPagesProps {
 }
 
 export default function TopPages({ pages }: TopPagesProps) {
-  if (pages.length === 0) {
+  if (!pages || pages.length === 0) {
     return (
       <div className="bg-white dark:bg-neutral-900 border border-neutral-200 dark:border-neutral-800 rounded-xl p-6">
         <h3 className="text-lg font-semibold mb-4 text-neutral-900 dark:text-white">

components/dashboard/TopReferrers.tsx

@@ -7,7 +7,7 @@ interface TopReferrersProps {
 }
 
 export default function TopReferrers({ referrers }: TopReferrersProps) {
-  if (referrers.length === 0) {
+  if (!referrers || referrers.length === 0) {
     return (
       <div className="bg-white dark:bg-neutral-900 border border-neutral-200 dark:border-neutral-800 rounded-xl p-6">
         <h3 className="text-lg font-semibold mb-4 text-neutral-900 dark:text-white">

components/sites/SiteList.tsx

@@ -19,9 +19,10 @@ export default function SiteList() {
     try {
       setLoading(true)
       const data = await listSites()
-      setSites(data)
+      setSites(Array.isArray(data) ? data : [])
     } catch (error: any) {
       toast.error('Failed to load sites: ' + (error.message || 'Unknown error'))
+      setSites([]) // Ensure sites is always an array
     } finally {
       setLoading(false)
     }