diff --git a/TopModel.Generator/Program.cs b/TopModel.Generator/Program.cs
index 97f13f3b..c705ea45 100644
--- a/TopModel.Generator/Program.cs
+++ b/TopModel.Generator/Program.cs
@@ -628,6 +628,10 @@ void HandleFile(FileInfo file)
 static string? GetFolderHash(string path)
 {
     var md5 = MD5.Create();
+    if (!Directory.Exists(path))
+    {
+        return null;
+    }
 
     var files = Directory.GetFiles(path, "*", SearchOption.AllDirectories).OrderBy(p => p).ToList();
     foreach (var file in files)