Glass reflection renders with a white strip

When I render glass at night, the interior reflection creates a white strip at the bottom of the render. Does it have to do with the glass settings?

Where is the white strip?

The only funky thing I see is that two stair steps do not have any materials assigned. (Or, you have two copies on top of each other.)

I think you mean the lighter-colored edge at the bottom of the glass. That appears to be the floor geometry on the other side of the glass. Yes?

Yes, by the white strip i mean the bottom of the glass. I will check the floor material on the other side now!