diff --git a/include/functions2.php b/include/functions2.php
index 45c73b3736487df1d46af8a11035b6e6cf941664..669bbe038634c83cddd42532b13f623f6041d3b9 100644
--- a/include/functions2.php
+++ b/include/functions2.php
@@ -2426,7 +2426,7 @@
 	}
 
 	function theme_valid($file) {
-		if ($file == "default.css") return true; // needed for array_filter
+		if ($file == "default.css" || $file == "night.css") return true; // needed for array_filter
 		$file = "themes/" . basename($file);
 
 		if (file_exists($file) && is_readable($file)) {