A few more runtime fixes.

code/game/machinery/dance_machine.dm

@@ -406,12 +406,11 @@
 	lying_prev = 0
 
 /obj/machinery/jukebox/proc/dance_over()
-	SSjukeboxes.removejukebox(SSjukeboxes.findjukeboxindex(src))
+	var/position = SSjukeboxes.findjukeboxindex(src)
+	if(!position)
+		return
+	SSjukeboxes.removejukebox(position)
 	STOP_PROCESSING(SSobj, src)
-	for(var/mob/living/L in rangers)
-		if(!L || !L.client)
-			continue
-		L.stop_sound_channel(CHANNEL_JUKEBOX)
 	rangers = list()
 
 /obj/machinery/jukebox/disco/dance_over()