diff --git a/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php b/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php
index af4de9613656..803ac1dcf47c 100644
--- a/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php
+++ b/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php
@@ -946,7 +946,7 @@ protected function dumpLine(int $depth, bool $endOfValue = false)
if (-1 === $this->lastDepth) {
$this->line = sprintf($this->dumpPrefix, $this->dumpId, $this->indentPad).$this->line;
}
- if ($this->headerIsDumped !== ($this->outputStream ?? $this->lineDumper)) {
+ if ($this->headerIsDumped !== (null !== ($this->outputStream ?? $this->lineDumper))) {
$this->line = $this->getDumpHeader().$this->line;
}
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