XF 1.4 Crawler Can't Detect Base URL, Pointing to Other Domain


I found thousands of 404 error in Google Webmaster Tool for my other domain because Google crawler pointing my forum URL to the wrong domain.
My forum is forum.winpoin.com, and I have several domain on the same server (nginx) including macpoin.com.

However, google crawl to the wrong domain and lead to 404 error for macpoin.com.

Screen Shot 2017-01-30 at 12.49.54.png

I think that's because the crawler can't read base URL on my forum, since the real visitor pointed to the right domain.

Any idea how to fix this issue?
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