diff --git a/lib/params.js b/lib/params.js
index 3da92e2..b18a713 100644
--- a/lib/params.js
+++ b/lib/params.js
@@ -83,7 +83,7 @@ module.exports = function (program) {
       })
       .then(() => {
         // Verify optional parameters
-        if (program.devCert.match(/.p12$/i)) {
+        if (program.devCert && program.devCert.match(/.p12$/i)) {
           if (!program.certPass) {
             utils.debug(`Error: Using a P12 certification file but the password is missing`)
             return reject(new Error('No certificate password specified!'))