diff --git a/packages/cli/src/modules/build/lib/bundler/server.ts b/packages/cli/src/modules/build/lib/bundler/server.ts
index ea6ee908b4..2af8d7a921 100644
--- a/packages/cli/src/modules/build/lib/bundler/server.ts
+++ b/packages/cli/src/modules/build/lib/bundler/server.ts
@@ -195,8 +195,10 @@ DEPRECATION WARNING: React Router Beta is deprecated and support for it will be
           ? {
               type: 'https',
               options: {
-                cert: fullConfig.getString('app.https.certificate.cert'),
-                key: fullConfig.getString('app.https.certificate.key'),
+                cert: fullConfig.getOptionalString(
+                  'app.https.certificate.cert',
+                ),
+                key: fullConfig.getOptionalString('app.https.certificate.key'),
               },
             }
           : {},