>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3494135. --> Reported by: [davidpetit](https://www.drupal.org/user/856744) Related to !77 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>We encountered this error in one project:<br> TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in count() (line 99 of modules/contrib/book/src/Controller/RouteAccessController.php).</p> <p>Drupal\book\Controller\RouteAccessController-&gt;checkIfChildIsGreaterThanOne() (Line: 76)</p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <p>It seems like this happens when we have a multilingual book and when some translation is unpublished and other are published.</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>I found out this bug is easily fixed by replacing :</p> <div class="codeblock"> <pre><span style="color: #000000"><span style="color: #0000BB">&lt;?php<br></span><span style="color: #007700">return </span><span style="color: #0000BB">count</span><span style="color: #007700">(</span><span style="color: #0000BB">$child</span><span style="color: #007700">[</span><span style="color: #DD0000">'below'</span><span style="color: #007700">]) &gt; </span><span style="color: #0000BB">1</span><span style="color: #007700">;<br></span><span style="color: #0000BB">?&gt;</span></span></pre></div> <p>with:</p> <div class="codeblock"> <pre><span style="color: #000000"><span style="color: #0000BB">&lt;?php<br></span><span style="color: #007700">return !empty(</span><span style="color: #0000BB">$child</span><span style="color: #007700">[</span><span style="color: #DD0000">'below'</span><span style="color: #007700">]) &amp;&amp; </span><span style="color: #0000BB">count</span><span style="color: #007700">(</span><span style="color: #0000BB">$child</span><span style="color: #007700">[</span><span style="color: #DD0000">'below'</span><span style="color: #007700">]) &gt; </span><span style="color: #0000BB">1</span><span style="color: #007700">;<br></span><span style="color: #0000BB">?&gt;</span></span></pre></div>