Best action to take for "error" URLs?

[theLotter]

My site has many error URLs that Google webmaster has identified as pages without titles.

These are URLs such as: www.site.com/page???1234

For these URLs should I:

1. Add them as duplicate canonicals to the correct page (that is being displayed on the error URLs)

2. Add 301 redirect to the correct URL

3. Block the pages in robots.txt

Thanks!

[ramangarg]

From my understanding, if you no links going to that url, it might be the crawler verifying existence of the 404 page.

So displaying a 404 page is best option for that.

However, if you have links going to that url, you should either fix those(if internal) or do 301 redirect as you said.