diff --git a/classes/template.php b/classes/template.php
index 222703a..0e33ab5 100644
--- a/classes/template.php
+++ b/classes/template.php
@@ -79,7 +79,7 @@ class template {
         $savedata = new \stdClass();
         $savedata->id = $this->id;
         $savedata->name = $data->name;
-        $savedata->html = $data->html || $this->html;
+        $savedata->html = $data->html ?: $this->html;
         $savedata->timemodified = time();
 
         $DB->update_record('htmlcert_templates', $savedata);