Endpoint/Program.cs

@@ -102,7 +102,7 @@ public class Program
             {
                 var provider = app.Services.GetService<IApiVersionDescriptionProvider>();
 
-                foreach (var description in provider.ApiVersionDescriptions)
+                foreach (var description in provider!.ApiVersionDescriptions)
                 {
                     var url = $"/swagger/{description.GroupName}/swagger.json";
                     var name = description.GroupName.ToUpperInvariant();