diff --git a/src/electron/services/electronMainMessaging.service.ts b/src/electron/services/electronMainMessaging.service.ts
index c823751e8a4..765aa2fe979 100644
--- a/src/electron/services/electronMainMessaging.service.ts
+++ b/src/electron/services/electronMainMessaging.service.ts
@@ -42,7 +42,7 @@ export class ElectronMainMessagingService implements MessagingService {
         });
 
         nativeTheme.on('updated', () => {
-            windowMain.win.webContents.send('systemThemeUpdated', nativeTheme.shouldUseDarkColors ? 'dark' : 'light');
+            windowMain.win?.webContents.send('systemThemeUpdated', nativeTheme.shouldUseDarkColors ? 'dark' : 'light');
         });
     }