From Ancient Greek φάσμα (phásma) +‎ -phobia.

phasmophobia (uncountable)

1. The fear of ghosts/supernatural beings.
   • 2008, E a Bucchianeri, Faust: My Soul Be Damned for the World, volume 2, page 55:

     He also suffered from hypsophobia, a certain fear of elevated places, and the typical scotophobia and phasmophobia associated with churches, graveyards and solitary places in the dark of night.