ghost step 

The act of walking in the dark up or downstairs and taking an additional step that does not exist.

I almost broke my damn neck last night, I was coming the stairs when I took a ghost step and almost ate it.

ghost step by King Jeruz December 17, 2013

Ghost step 

Stepping off an elevated level and not realizing it, thus you fall of the level rather than stepping off properly.

The magician not realizing the stages edge was close went ghost step to facial.

Ghost step by Danmaj August 31, 2015