diff --git a/windows/TweetImpl.CefSharp/Component/BrowserComponentBase.cs b/windows/TweetImpl.CefSharp/Component/BrowserComponentBase.cs
index b0e8ed20..dcf97d25 100644
--- a/windows/TweetImpl.CefSharp/Component/BrowserComponentBase.cs
+++ b/windows/TweetImpl.CefSharp/Component/BrowserComponentBase.cs
@@ -59,11 +59,15 @@ private void OnLoadError(object? sender, LoadErrorEventArgs e) {
 		}
 
 		private void OnFrameLoadStart(object? sender, FrameLoadStartEventArgs e) {
-			base.OnFrameLoadStart(e.Url, e.Frame);
+			if (!string.IsNullOrEmpty(e.Url)) {
+				base.OnFrameLoadStart(e.Url, e.Frame);
+			}
 		}
 
 		private void OnFrameLoadEnd(object? sender, FrameLoadEndEventArgs e) {
-			base.OnFrameLoadEnd(e.Url, e.Frame);
+			if (!string.IsNullOrEmpty(e.Url)) {
+				base.OnFrameLoadEnd(e.Url, e.Frame);
+			}
 		}
 	}
 }