Can't close a segment on a circular band

Hi, I can’t seem to create a face by drawing a line from the inner to the outer band of a circular face. I am trying to get a line on top of a guideline so that it lines up with other objects in my model, but for some reason it won’t close the face. It will when it’s just a hair off of it though. The section in question is highlighted yellow, and you can see the line i’ve drawn very close to the diagonal guideline when you zoom in. What am I doing wrong?segment.skp (97.6 KB)

The guide isn’t on the face.
Guide

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Ahh, jeezus, thanks for pointing that out. I ended up fixing it by just drawing a line from the center and erasing after.