diff --git a/src/Readability.php b/src/Readability.php
index 290cc28..79e42ff 100644
--- a/src/Readability.php
+++ b/src/Readability.php
@@ -1480,6 +1480,7 @@ private function hasSingleTagInsideElement(\DOMElement $node, string $tag): bool
         $childNodes = iterator_to_array($node->childNodes);
         $children = array_filter($childNodes, fn ($childNode) => $childNode instanceof \DOMElement);
 
+        $children = array_values($children);
         // There should be exactly 1 element child with given tag
         if (1 !== \count($children) || $children[0]->nodeName !== $tag) {
             return false;