diff --git a/package-lock.json b/package-lock.json
index d9b5c9f..1990c87 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@sek1ro/iterables",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@sek1ro/iterables",
-      "version": "0.1.0",
+      "version": "0.1.1",
       "license": "LGPL-3.0-only",
       "devDependencies": {
         "vitest": "^3.1.1"
diff --git a/package.json b/package.json
index a615643..2eefef6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@sek1ro/iterables",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "description": "A data structures library based on iterators, inspired by libstdc++",
   "main": "dist/index.js",
   "files": [
@@ -17,4 +17,4 @@
   "devDependencies": {
     "vitest": "^3.1.1"
   }
-}
\ No newline at end of file
+}
diff --git a/src/iterators/Forward.js b/src/iterators/Forward.js
index 3a5f117..7fad264 100644
--- a/src/iterators/Forward.js
+++ b/src/iterators/Forward.js
@@ -6,7 +6,7 @@ export class ForwardIterator {
   }
 
   get value() {
-    return this.deref().value
+    return this.deref()?.value
   }
 
   set value(value) {
diff --git a/test/List.test.js b/test/List.test.js
index 24b9244..0be45dd 100644
--- a/test/List.test.js
+++ b/test/List.test.js
@@ -49,6 +49,7 @@ test('move, empty', () => {
 
 test('constructor, assign', () => {
   expect(new List().size()).toEqual(0)
+  expect(new List().back).toEqual(undefined)
   expect(listEquArray(new List(null), [null])).toBeTruthy()
   expect(listEquArray(new List(null, 2), [null, null])).toBeTruthy()
   {