diff --git a/src/SoapCore/MetaWCFBodyWriter.cs b/src/SoapCore/MetaWCFBodyWriter.cs
index 43394d61..4955829e 100644
--- a/src/SoapCore/MetaWCFBodyWriter.cs
+++ b/src/SoapCore/MetaWCFBodyWriter.cs
@@ -951,7 +951,7 @@ private bool HasBaseType(Type type)
 
 			var baseType = type.GetTypeInfo().BaseType;
 
-			return !isArrayType && !type.IsEnum && !type.IsPrimitive && !baseType.Name.Equals("Object");
+			return !isArrayType && !type.IsEnum && !type.IsPrimitive && baseType != null && !baseType.Name.Equals("Object");
 		}
 	}
 }