People are spawning in with a null species

Created by: gbasood

19:02:59 Runtime detected
Cannot execute null.handle post spawn(). at human.dm:1452
 proc name: set species (/mob/living/carbon/human/proc/set_species)
  source file: human.dm,1452
  usr: (src)
  src: the unknown (/mob/living/carbon/human)
  src.loc: null
  call stack:
the unknown (/mob/living/carbon/human): set species("Human", null, null)

runtime error: Cannot execute null.handle post spawn().
proc name: set species (/mob/living/carbon/human/proc/set_species)
  source file: human.dm,1452
  usr: (src)
  src: the unknown (/mob/living/carbon/human)
  src.loc: null
  call stack:
the unknown (/mob/living/carbon/human): set species("Human", null, null)