Fixes being able to buckle more than one mob to bucklable things

code/game/objects/structures/stool_bed_chair_nest/bed.dm

@@ -129,6 +129,9 @@
 	else if(istype(W, /obj/item/weapon/grab))
 		var/obj/item/weapon/grab/G = W
 		var/mob/living/affecting = G.affecting
+		if(has_buckled) //Handles trying to buckle someone else to a chair when someone else is on it
+			user  << "<span class='notice'>\The [src] already has someone buckled to it.</span>"
+			return
 		user.visible_message("<span class='notice'>[user] attempts to buckle [affecting] into \the [src]!</span>")
 		if(do_after(user, 20))
 			affecting.loc = loc