diff --git a/src/Nancy.OpenApi/Infrastructure/RouteMetadataProvider.cs b/src/Nancy.OpenApi/Infrastructure/RouteMetadataProvider.cs
index 1d75e56..0d672d8 100644
--- a/src/Nancy.OpenApi/Infrastructure/RouteMetadataProvider.cs
+++ b/src/Nancy.OpenApi/Infrastructure/RouteMetadataProvider.cs
@@ -45,7 +45,7 @@ private static Type GetModuleMetadataType(INancyModule module)
             if (ModuleTypes.TryGetValue(metadataName, out type)) return type;
 
             type = AppDomain.CurrentDomain.GetAssemblies()
-                            .SelectMany(x => x.GetTypes())
+                            .SelectMany(x => x.SafeGetTypes())
                             .FirstOrDefault(x => x.Name == metadataName);
 
             ModuleTypes.Add(metadataName, type);
@@ -57,4 +57,4 @@ private static Type GetModuleMetadataType(INancyModule module)
         private static readonly Dictionary<Type, ModuleMetadata> MetadataItems = new Dictionary<Type, ModuleMetadata>();
         private readonly TinyIoCContainer _container;
     }
-}
\ No newline at end of file
+}