A few fixes.

code/game/objects/effect_system.dm

@@ -195,7 +195,7 @@ steam.start() -- spawns the effect
 			if(src.total_sparks > 20)
 				return
 			spawn(0)
-				if(holder)
+				if(holder || !istype(holder,/datum))
 					src.location = get_turf(holder)
 				var/obj/effect/effect/sparks/sparks = new /obj/effect/effect/sparks(src.location)
 				src.total_sparks++

code/game/objects/items/weapons/implants/implanter.dm

@@ -114,8 +114,7 @@
 	..()
 
 /obj/item/weapon/implanter/compressed/afterattack(atom/A, mob/user as mob)
-	if(istype(A,/obj/item))
-		var/obj/item/weapon/implant/compressed/c = imp
-		c.scanned = A
+	if(istype(A,/obj/item) && imp)
+		imp:scanned = A
 		A.loc.contents.Remove(A)
 		update()