diff --git a/ios/chrome/browser/reading_list/model/reading_list_distiller_page.mm b/ios/chrome/browser/reading_list/model/reading_list_distiller_page.mm
--- a/ios/chrome/browser/reading_list/model/reading_list_distiller_page.mm
+++ b/ios/chrome/browser/reading_list/model/reading_list_distiller_page.mm
@@ -239,10 +239,11 @@ bool ReadingListDistillerPage::IsGoogleCachedAMPPage() {
   if (!url.is_valid() || !url.SchemeIs(url::kHttpsScheme)) {
     return false;
   }
+  // GURL::path() includes the leading '/', so compare against "/amp/".
   if (!google_util::IsGoogleDomainUrl(
           url, google_util::DISALLOW_SUBDOMAIN,
           google_util::DISALLOW_NON_STANDARD_PORTS) ||
-      !url.GetPath().compare(0, 4, "amp/")) {
+      url.path().compare(0, 5, "/amp/") != 0) {
     return false;
   }
   const web::SSLStatus& ssl_status = CurrentWebState()
@@ -279,7 +280,9 @@ void ReadingListDistillerPage::OnHandleGoogleCachedAMPPageResult(
     NSError* error) {
   if (!error && value->is_string()) {
     GURL new_gurl(value->GetString());
-    if (new_gurl.is_valid()) {
+    // The URL is sourced from page-world JavaScript on the AMP cache page.
+    // Restrict the follow-up navigation to web schemes.
+    if (new_gurl.is_valid() && new_gurl.SchemeIsHTTPOrHTTPS()) {
       FetchFavicon(new_gurl);
       web::NavigationManager::WebLoadParams params(new_gurl);
       CurrentWebState()->GetNavigationManager()->LoadURLWithParams(params);