diff --git a/src/usr/local/emhttp/plugins/tailscale/include/webgui-cert.php b/src/usr/local/emhttp/plugins/tailscale/include/webgui-cert.php
index 8516307..350e278 100644
--- a/src/usr/local/emhttp/plugins/tailscale/include/webgui-cert.php
+++ b/src/usr/local/emhttp/plugins/tailscale/include/webgui-cert.php
@@ -6,7 +6,7 @@ function refreshWebGuiCert($restartIfChanged = true)
 
     $certDomains = $status->CertDomains;
 
-    if (count($certDomains) === 0) {
+    if (count($certDomains ?? array()) === 0) {
         logmsg("Cannot generate certificate for WebGUI -- HTTPS not enabled for Tailnet.");
         return;
     }