diff --git a/Gemini-iOS/SceneDelegate.swift b/Gemini-iOS/SceneDelegate.swift
index 356a692..95fb111 100644
--- a/Gemini-iOS/SceneDelegate.swift
+++ b/Gemini-iOS/SceneDelegate.swift
@@ -99,7 +99,8 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
 extension SceneDelegate: NavigationManagerDelegate {
     func loadNonGeminiURL(_ url: URL) {
         UIApplication.shared.open(url, options: [.universalLinksOnly: true]) { (success) in
-            if !success {
+            guard !success else { return }
+            if url.scheme == "http" || url.scheme == "https" {
                 if Preferences.shared.useInAppSafari {
                     let config = SFSafariViewController.Configuration()
                     config.entersReaderIfAvailable = Preferences.shared.useReaderMode
@@ -108,6 +109,13 @@ extension SceneDelegate: NavigationManagerDelegate {
                 } else {
                     UIApplication.shared.open(url, options: [:])
                 }
+            } else {
+                let alert = UIAlertController(title: "Cannot open '\(url.scheme!)' URL", message: url.absoluteString, preferredStyle: .alert)
+                alert.addAction(UIAlertAction(title: "Copy URL", style: .default, handler: { (_) in
+                    UIPasteboard.general.setObjects([url])
+                }))
+                alert.addAction(UIAlertAction(title: "OK", style: .cancel, handler: nil))
+                self.window!.rootViewController!.present(alert, animated: true)
             }
         }
     }