diff --git a/server/util-server.js b/server/util-server.js
index 6642930a0..d5fe99106 100644
--- a/server/util-server.js
+++ b/server/util-server.js
@@ -741,7 +741,7 @@ exports.checkCertificateHostname = function (certBuffer, hostname) {
         return true;
     }
 
-    if (!certBuffer || !hostname) {
+    if (!X509Certificate || !certBuffer || !hostname) {
         return true;
     }