diff --git a/lib/src/312/categories/age_geek_code_category.dart b/lib/src/312/categories/age_geek_code_category.dart
index 2ea734d..dd9930e 100644
--- a/lib/src/312/categories/age_geek_code_category.dart
+++ b/lib/src/312/categories/age_geek_code_category.dart
@@ -54,5 +54,5 @@ class AgeGeekCodeCategory extends GeekCodeCategory {
       : this._builder = builder,
         super(builder, grade);
 
-  String toString() => super.toString() + "${_builder._age}";
+  String toString() => super.toString() + (_builder._age != null ? _builder._age : "");
 }
diff --git a/pubspec.yaml b/pubspec.yaml
index 003ee57..6952de1 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: geek_code
-version: 2.0.0
+version: 2.0.1
 author: Meshulam Silk <moomoohk@ymail.com>
 description: Dart implementation of The Geek Code
 homepage: http://moomoohk.github.io/projects/geek_code
diff --git a/test/all_test.dart b/test/all_test.dart
index 45762e4..221fbd4 100644
--- a/test/all_test.dart
+++ b/test/all_test.dart
@@ -9,7 +9,7 @@ main() {
   GeekCodeV312 code = new GeekCodeV312([G312.IT, G312.CS, G312.B, G312.C] as List<GeekCodeType>)
     ..addCategory(d.refuse())
     ..addCategory(s.refuse())
-    ..addCategory(a.age(20))
+    ..addCategory(a.grade(new GeekCodeGrade(1)))
     ..addCategory(C.grade(new GeekCodeGrade(2)))
     ..addCategory(U.refuse())
     ..addCategory(P.noKnowledge())