The key thing here is whether the space is shown in the search results.

I think its unlikely that it would cause any SEO issues, if however the space shows in Google results there is a high chance it would affect your click thrus as extra spaces, weird characters etc in page titles tend to suggest that the site is less trustworthy (in my opinion).

So if space is visible in your page title and/or search results, get it sorted. If it is just tabs and line returns in the source code you don't need to worry about it too much.

Hope that helps.