diff --git a/lib/browser/guest-window-manager.js b/lib/browser/guest-window-manager.js
index 3ff307ea7c24..d0fa3cd4e23b 100644
--- a/lib/browser/guest-window-manager.js
+++ b/lib/browser/guest-window-manager.js
@@ -24,14 +24,14 @@ const mergeOptions = function (child, parent) {
 
 // Merge |options| with the |embedder|'s window's options.
 const mergeBrowserWindowOptions = function (embedder, options) {
+  if (options.webPreferences == null) {
+    options.webPreferences = {}
+  }
   if (embedder.browserWindowOptions != null) {
     // Inherit the original options if it is a BrowserWindow.
     mergeOptions(options, embedder.browserWindowOptions)
   } else {
     // Or only inherit web-preferences if it is a webview.
-    if (options.webPreferences == null) {
-      options.webPreferences = {}
-    }
     mergeOptions(options.webPreferences, embedder.getWebPreferences())
   }