Redundant Hostnames ( Google )

[salue]

Hello hey guys

can anyone help me fix this issue on my site from google analytics 

it says ( 
Property Gamingpcforum is receiving data from redundant hostnames. Some of the redundant hostnames are:

• gamingpcforum.com
• www.gamingpcforum.com

Redundant hostnames are counted as separate rows in reports, so hits that are going to the same page on your site from different hostnames will be split into multiple rows. With data split across multiple rows, traffic to specific pages will appear lower than it actually is.

To avoid this problem, consider setting up a 301 redirect from one of your redundant hostnames to the other, or create a search-and-replace filter that strips "www." from hostnames. )

I do not want to lose SEO  can anyone help me resolve this issue ?

I am running the main page on WordPress and forum on IPB 4.0

 

I asked someone on another site about this issue they replied to me this :

This is just a guess, but it may be because your homepage is forcing the www subdomain but your forum directory is forcing non-www.

if what he said is true how can I fix it on IPB, I do not know how can anyone help me on this?