diff --git a/src/BuildingBlocks/Swagger/SwaggerDefaultValues.cs b/src/BuildingBlocks/Swagger/SwaggerDefaultValues.cs
index 2e12ba7..c115882 100644
--- a/src/BuildingBlocks/Swagger/SwaggerDefaultValues.cs
+++ b/src/BuildingBlocks/Swagger/SwaggerDefaultValues.cs
@@ -41,7 +41,12 @@ namespace BuildingBlocks.Swagger
             // REF: https://github.com/domaindrivendev/Swashbuckle.AspNetCore/pull/413
             foreach (var parameter in operation.Parameters)
             {
-                var description = apiDescription.ParameterDescriptions.First(p => p.Name == parameter.Name);
+                var description = apiDescription.ParameterDescriptions.FirstOrDefault(p => p.Name == parameter.Name);
+
+                if (description is null)
+                {
+                    return;
+                }
 
                 if (parameter.Description == null)
                 {