It works now.

code/game/objects/items/melee/misc.dm

@@ -216,10 +216,11 @@
 			return
 	else
 		if(last_hit < world.time)
+			if(target.check_shields(src, 0, "[user]'s [name]", MELEE_ATTACK))
+				playsound(target, 'sound/weapons/genhit.ogg', 50, 1)
+				return
 			if(ishuman(target))
 				var/mob/living/carbon/human/H = target
-				if (H.check_shields(src, 0, "[user]'s [name]", MELEE_ATTACK))
-					return
 				if(check_martial_counter(H, user))
 					return
 			playsound(get_turf(src), 'sound/effects/woodhit.ogg', 75, 1, -1)

code/game/objects/items/robot/robot_items.dm

@@ -11,11 +11,9 @@
 	var/charge_cost = 30
 
 /obj/item/borg/stun/attack(mob/living/M, mob/living/user)
-	if(ishuman(M))
-		var/mob/living/carbon/human/H = M
-		if(H.check_shields(src, 0, "[M]'s [name]", MELEE_ATTACK))
-			playsound(M, 'sound/weapons/genhit.ogg', 50, 1)
-			return FALSE
+	if(M.check_shields(src, 0, "[M]'s [name]", MELEE_ATTACK))
+		playsound(M, 'sound/weapons/genhit.ogg', 50, 1)
+		return FALSE
 	if(iscyborg(user))
 		var/mob/living/silicon/robot/R = user
 		if(!R.cell.use(charge_cost))

code/game/objects/items/stunbaton.dm

@@ -168,11 +168,9 @@
 
 
 /obj/item/melee/baton/proc/baton_stun(mob/living/L, mob/user)
-	if(ishuman(L))
-		var/mob/living/carbon/human/H = L
-		if(H.check_shields(src, 0, "[user]'s [name]", MELEE_ATTACK)) //No message; check_shields() handles that
-			playsound(L, 'sound/weapons/genhit.ogg', 50, 1)
-			return FALSE
+	if(L.check_shields(src, 0, "[user]'s [name]", MELEE_ATTACK)) //No message; check_shields() handles that
+		playsound(L, 'sound/weapons/genhit.ogg', 50, 1)
+		return FALSE
 	var/stunpwr = stunforce
 	var/obj/item/stock_parts/cell/our_cell = get_cell()
 	if(!our_cell)