Definitions by Transwarp Conduit

nihilophobia 

Fear of nothingness (comes from the combination of the Latin word nihil which means nothing, none, and the suffix -phobia)

Voyager's morale officer and chef Neelix suffers from nihilophobia, having panic attacks while the ship was traversing a dark expanse of space known as the Void.

nihilophobia by Transwarp Conduit July 13, 2016