diff --git a/lib/OpdsFeed.php b/lib/OpdsFeed.php
index 05193dce..6d1f47ec 100644
--- a/lib/OpdsFeed.php
+++ b/lib/OpdsFeed.php
@@ -20,17 +20,23 @@ class OpdsFeed{
 	}
 
 	private function Sha1Entries(string $xmlString): string{
-		$xml = new SimpleXMLElement(str_replace('xmlns=', 'ns=', $xmlString));
-		$xml->registerXPathNamespace('dc', 'http://purl.org/dc/elements/1.1/');
-		$xml->registerXPathNamespace('schema', 'http://schema.org/');
-		$entries = $xml->xpath('/feed/entry') ?? [];
+		try{
+			$xml = new SimpleXMLElement(str_replace('xmlns=', 'ns=', $xmlString));
+			$xml->registerXPathNamespace('dc', 'http://purl.org/dc/elements/1.1/');
+			$xml->registerXPathNamespace('schema', 'http://schema.org/');
+			$entries = $xml->xpath('/feed/entry') ?? [];
 
-		$output = '';
-		foreach($entries as $entry){
-			$output .= $entry->asXml();
+			$output = '';
+			foreach($entries as $entry){
+				$output .= $entry->asXml();
+			}
+
+			return sha1(preg_replace('/\s/ius', '', $output));
+		}
+		catch(Exception $ex){
+			// Invalid XML
+			return '';
 		}
-
-		return sha1(preg_replace('/\s/ius', '', $output));
 	}
 
 	public function Save(string $filename): void{
diff --git a/scripts/deploy-ebook-to-www b/scripts/deploy-ebook-to-www
index 9cba8e56..cf3643e6 100755
--- a/scripts/deploy-ebook-to-www
+++ b/scripts/deploy-ebook-to-www
@@ -227,7 +227,10 @@ if [ "${verbose}" = "true" ]; then
 	printf "Rebuilding OPDS catalog ... "
 fi
 
-bash -c "php \"${scriptsDir}\"/generate-opds.php --webroot \"${webRoot}\" --weburl \"${webUrl}\""
+php "${scriptsDir}/generate-opds.php" --webroot "${webRoot}" --weburl "${webUrl}"
+
+sudo chown se:committers /standardebooks.org/web/www/opds/*.xml
+sudo chmod 664 /standardebooks.org/web/www/opds/*.xml
 
 if [ "${verbose}" = "true" ]; then
 	printf "Done.\n"
diff --git a/templates/OpdsFeed.php b/templates/OpdsFeed.php
index 62287525..d5f7700c 100644
--- a/templates/OpdsFeed.php
+++ b/templates/OpdsFeed.php
@@ -14,7 +14,7 @@ if(!isset($isCrawlable)){
 
 print("<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
 ?>
-<feed xmlns="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:schema="http://schema.org/" xmlns:fh="http://purl.org/syndication/history/1.0">
+<feed xmlns="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:schema="http://schema.org/"<? if($isCrawlable){ ?> xmlns:fh="http://purl.org/syndication/history/1.0"<? } ?>>
 	<id><?= $id ?></id>
 	<link href="<?= $url ?>" rel="self" type="application/atom+xml;profile=opds-catalog;kind=acquisition"/>
 	<link href="<?= SITE_URL ?>/opds" rel="start" type="application/atom+xml;profile=opds-catalog;kind=navigation"/>