diff --git a/src/FilterLists.Agent/Extensions/UriExtensions.cs b/src/FilterLists.Agent/Extensions/UriExtensions.cs
index 0dd88cb42..d0eee94bd 100644
--- a/src/FilterLists.Agent/Extensions/UriExtensions.cs
+++ b/src/FilterLists.Agent/Extensions/UriExtensions.cs
@@ -9,5 +9,15 @@ public static string GetExtension(this Uri uri)
         {
             return Path.GetExtension(uri.AbsolutePath);
         }
+
+        public static bool IsValidUrl(this Uri uri)
+        {
+            var uriString = uri.OriginalString;
+            if (!Uri.IsWellFormedUriString(uriString, UriKind.Absolute))
+                return false;
+            if (!Uri.TryCreate(uriString, UriKind.Absolute, out var tmp))
+                return false;
+            return tmp.Scheme == Uri.UriSchemeHttp || tmp.Scheme == Uri.UriSchemeHttps;
+        }
     }
 }
\ No newline at end of file
diff --git a/src/FilterLists.Agent/Features/Urls/ValidateUrls.cs b/src/FilterLists.Agent/Features/Urls/ValidateUrls.cs
index f40913985..73358b024 100644
--- a/src/FilterLists.Agent/Features/Urls/ValidateUrls.cs
+++ b/src/FilterLists.Agent/Features/Urls/ValidateUrls.cs
@@ -5,6 +5,7 @@
 using System.Threading;
 using System.Threading.Tasks;
 using System.Threading.Tasks.Dataflow;
+using FilterLists.Agent.Extensions;
 using FilterLists.Agent.Features.Urls.Models.ValidationResults;
 using FilterLists.Agent.Infrastructure.Clients;
 using MediatR;
@@ -60,6 +61,13 @@ private TransformBlock<Uri, UrlValidationResult> BuildValidator(CancellationToke
                     async u =>
                     {
                         var result = new UrlValidationResult(u);
+                        if (!u.IsValidUrl())
+                        {
+                            result.SetBroken();
+                            _logger.LogError($"{u.AbsoluteUri}) is not a valid URL.");
+                            return result;
+                        }
+
                         try
                         {
                             var response = await _httpClient.GetAsync(u, cancellationToken);