If domain is not forwarding non-www to www then this is solving your problem How to redirect non www to www in godaddy.
Watch the video forward non www to www Godaddy dns manager below to solve your problem.
If you buy a domain from Godaddy and your blogger custom domain website is not working without www ie, naked domain like yourdomain.com is not forwading to www.yourdomain.com in Godaddy DNS management. Then first of all I would like to tell you watch below video.
Subscribe Earning Baba
If you setup custom domain in blogger with a domain purchasing from Godaddy and if your Blogger custom domain site is working with www domain and not working without www domain (Non www domain or naked domain) and Non www domain redirect to Godaddy error page then I am going to show you How to redirect non www to www in godaddy.
If Website doesn’t works without “www” after adding custom domain in blogger then After watching this your site will be redirected to non www to www domain.
and your website doesn’t work without www godaddy will be working.
You can also read How to create a blog on Blogger with custom domain setup
Redirect non www to www in godaddy
Follow the steps:
Step 1: Login to your domain account
Step 2: Click manage on the domain for setup
Step 3: After clicking on gear icon click on manage DNS
Step 4: In your DNS Management, go to Forwarding where you will find Domain & Subdomain. Add a subdomain here.
Step 5: Insert your naked domain here in SUBDOMAIN (eg: yourdomain.com) LIKE This
SUBDOMAIN:yourdomain.com
FORWARD TO : www.yourdomain.com
FORWARD TYPE: Permanent (301)
SETTING : Forward only

After that click on save button. That is it. You are done. Just wait for 30 minutes and check your site. it will be working 100%.