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+---
+title: 'TypeError: "x" has no properties'
+slug: Web/JavaScript/Reference/Erreurs/No_properties
+tags:
+  - Erreurs
+  - JavaScript
+  - Reference
+  - TypeError
+translation_of: Web/JavaScript/Reference/Errors/No_properties
+---
+<div>{{jsSidebar("Errors")}}</div>
+
+<h2 id="Message">Message</h2>
+
+<pre class="syntaxbox">TypeError: Unable to get property {x} of undefined or null reference (Edge)
+TypeError: null has no properties (Firefox)
+TypeError: undefined has no properties (Firefox)
+</pre>
+
+<h2 id="Type_d'erreur">Type d'erreur</h2>
+
+<p>{{jsxref("TypeError")}}.</p>
+
+<h2 id="Quel_est_le_problème">Quel est le problème ?</h2>
+
+<p>Les valeurs {{jsxref("null")}} et {{jsxref("undefined")}} n'ont aucunes propriétés auxquelles accéder.</p>
+
+<h2 id="Exemples">Exemples</h2>
+
+<pre class="brush: js example-bad">null.toto;
+// TypeError: null has no properties
+
+undefined.truc;
+// TypeError: undefined has no properties
+</pre>
+
+<h2 id="Voir_aussi">Voir aussi</h2>
+
+<ul>
+ <li>{{jsxref("null")}}</li>
+ <li>{{jsxref("undefined")}}</li>
+</ul>