diff --git a/csr.js b/csr.js
index 8fd57bf..4543773 100644
--- a/csr.js
+++ b/csr.js
@@ -127,28 +127,33 @@ function createPkcs10Csr(domainKeypair, domains) {
       ]
     });
 
-    var altNames = new org.pkijs.simpl.GENERAL_NAMES({
-      names: [
-        new org.pkijs.simpl.GENERAL_NAME({
-          NameType: 2,
-          Name: domains.join(', DNS:') //"domain1.com, DNS:domain2.com, DNS:domain3.com"
-        })
-      ]
-    });
+    function addSan() {
+      var altNames = new org.pkijs.simpl.GENERAL_NAMES({
+        names: [
+          new org.pkijs.simpl.GENERAL_NAME({
+            NameType: 2,
+            Name: domains.join(', DNS:') //"domain1.com, DNS:domain2.com, DNS:domain3.com"
+          })
+        ]
+      });
 
-    extensions.extensions_array.push(new org.pkijs.simpl.EXTENSION({
-      extnID: "2.5.29.17", // subjectAltName
-      critical: false,
-      extnValue: altNames.toSchema().toBER(false)
-    }));
+      extensions.extensions_array.push(new org.pkijs.simpl.EXTENSION({
+        extnID: "2.5.29.17", // subjectAltName
+        critical: false,
+        extnValue: altNames.toSchema().toBER(false)
+      }));
 
-    var attribute = new org.pkijs.simpl.ATTRIBUTE({
-      type: "1.2.840.113549.1.9.14", // pkcs-9-at-extensionRequest
-      values: [extensions.toSchema()]
-    });
+      var attribute = new org.pkijs.simpl.ATTRIBUTE({
+        type: "1.2.840.113549.1.9.14", // pkcs-9-at-extensionRequest
+        values: [extensions.toSchema()]
+      });
 
-    pkcs10_simpl.attributes.push(attribute);
+      pkcs10_simpl.attributes.push(attribute);
+    }
 
+    if (domains.length) {
+      addSan();
+    }
   });
   // #endregion
 
@@ -183,4 +188,4 @@ CSR.generate = function (options) {
   return createPkcs10Csr(options.keypair, options.domains);
 };
 
-}(window));
+}(window));
\ No newline at end of file