fixes new players logging out causing a GC fail (#20340)

code/modules/mob/new_player/new_player_logout.dm

@@ -2,6 +2,7 @@
 	ready = FALSE
 	..()
 	if(!spawning)//Here so that if they are spawning and log out, the other procs can play out and they will have a mob to come back to.
+		mind.current = null // We best null their mind as well, otherwise /every/ single new player is going to explode the server a little more by logging out
 		key = null//We null their key before deleting the mob, so they are properly kicked out.
 		qdel(src)
 	return