Ton of spur sound runtimes

Created by: Probe1

runtime error: code/game/sound.dm:26:Assertion Failed: !isnull(turf_source)
proc name: playsound (/proc/playsound)
  source file: sound.dm,26
  usr: Xenon Deadhead (/mob/living/carbon/human)
  src: null
  call stack:
playsound(, 'sound/weapons/spur_hitwall.ogg', 30, 1, null, null, 1)
the spur bullet (/obj/item/projectile/spur): Bump(the reinforced window (/obj/structure/window/reinforced), 1)
the floor (144,125,1) (/turf/simulated/floor): Enter(the spur bullet (/obj/item/projectile/spur), the floor (143,125,1) (/turf/simulated/floor/wood))
the floor (144,125,1) (/turf/simulated/floor): Enter(the spur bullet (/obj/item/projectile/spur), the floor (143,125,1) (/turf/simulated/floor/wood))
the spur bullet (/obj/item/projectile/spur): Move(the floor (144,125,1) (/turf/simulated/floor), 0, 0, 0)
the spur bullet (/obj/item/projectile/spur): bresenham step(4, 0, 4, 2)
the spur bullet (/obj/item/projectile/spur): process step()
the spur bullet (/obj/item/projectile/spur): process step()
the spur bullet (/obj/item/projectile/spur): process()

runtime error: code/game/sound.dm:26:Assertion Failed: !isnull(turf_source)
proc name: playsound (/proc/playsound)
  source file: sound.dm,26
  usr: Xenon Deadhead (/mob/living/carbon/human)
  src: null
  call stack:
playsound(, 'sound/weapons/spur_hitmob.ogg', 30, 1, null, null, 1)
the spur bullet (/obj/item/projectile/spur): Bump(the bees (/mob/living/simple_animal/bee))
the spur bullet (/obj/item/projectile/spur): bump original check()
the spur bullet (/obj/item/projectile/spur): bresenham step(4, 0, 4, 2)
the spur bullet (/obj/item/projectile/spur): process step()
the spur bullet (/obj/item/projectile/spur): process step()
the spur bullet (/obj/item/projectile/spur): process()
12:28:35 Runtime detected
code/game/sound.dm:26:Assertion Failed: !isnull(turf_source) at sound.dm:26
 proc name: playsound (/proc/playsound)
  source file: sound.dm,26
  usr: Xenon Deadhead (/mob/living/carbon/human)
  src: null
  call stack:
playsound(, 'sound/weapons/spur_hitmob.ogg', 30, 1, null, null, 1)
the spur bullet (/obj/item/projectile/spur): Bump(the alien drone (/mob/living/simple_animal/hostile/alien/drone))
the spur bullet (/obj/item/projectile/spur): bump original check()
the spur bullet (/obj/item/projectile/spur): bresenham step(4, 0, 4, 2)
the spur bullet (/obj/item/projectile/spur): process step()
the spur bullet (/obj/item/projectile/spur): process step()
the spur bullet (/obj/item/projectile/spur): process()

Check the runtime log for today to find more, but mostly duplicates http://ss13.undo.it/logs/Dev/runtime/2015-11-28-runtime.log