How to avoid edge detection of a mesh alligned to another one?

Hello people, first of all, thanks for your time.

I'm using the Edge Detection Script included in the Standard Assets of Unity 5 (if there is another one better than this and free, let me know please) but I'm having a little bit annoying issue with this effect.

I've created a modular scenario (different wall models, for example), but when I put them together perfectly alligned (using V to move and snap to vertex) there is a small gap or something and the script detects an edge, and it becomes a very ugly effect (Image attached will explain better)

As you can see, through the line that conects these two pieces are some 'black dots' produced by the Edge Detection Script, and I want to avoid these kind of artifacts...

I've been thinking about using another script, but I couldn't find another one, or even modelling my complete scenario at once, but I don't see this like a good option...

I hope you can help me. Thank you very much!