diff --git a/app/Models/ApplicationPreview.php b/app/Models/ApplicationPreview.php
index f45f9da40..aa31268f1 100644
--- a/app/Models/ApplicationPreview.php
+++ b/app/Models/ApplicationPreview.php
@@ -74,7 +74,7 @@ class ApplicationPreview extends BaseModel
 
     public function generate_preview_fqdn()
     {
-        if (is_null($this->fqdn) && $this->application->fqdn) {
+        if (empty($this->fqdn) && $this->application->fqdn) {
             if (str($this->application->fqdn)->contains(',')) {
                 $url = Url::fromString(str($this->application->fqdn)->explode(',')[0]);
                 $preview_fqdn = getFqdnWithoutPort(str($this->application->fqdn)->explode(',')[0]);