Allow non null values for element

diff --git a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeProcessor.class.php b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeProcessor.class.php
index 1a23a38ff2681204a03a663b9ac979a2d1e59522..5b794e2b1e529c2e509c16d8d46acdd90bf03e0d 100644 (file)
--- a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeProcessor.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeProcessor.class.php
@@ -849,7 +849,7 @@ class HtmlInputNodeProcessor extends AbstractHtmlNodeProcessor
         }
     }
 
-    private function getNonEmptyNode(?\DOMNode $element, string $property): ?\DOMNode
+    private function getNonEmptyNode(\DOMNode $element, string $property): ?\DOMNode
     {
         while ($element = $element->{$property}) {
             if (!DOMUtil::isEmpty($element)) {