diff --git a/lib/private/Files/Stream/SeekableHttpStream.php b/lib/private/Files/Stream/SeekableHttpStream.php
index 51ccaeba998..66f94768e62 100644
--- a/lib/private/Files/Stream/SeekableHttpStream.php
+++ b/lib/private/Files/Stream/SeekableHttpStream.php
@@ -219,7 +219,9 @@ class SeekableHttpStream implements File {
 	public function stream_stat() {
 		if ($this->getCurrent()) {
 			$stat = fstat($this->getCurrent());
-			$stat['size'] = $this->totalSize;
+			if ($stat) {
+				$stat['size'] = $this->totalSize;
+			}
 			return $stat;
 		} else {
 			return false;