Theoretically fix new player runtime (#17739)

code/modules/mob/new_player/login.dm

@@ -1,4 +1,10 @@
 /mob/new_player/Login()
+	// Happens sometimes
+	if(QDELETED(src))
+		var/mob/new_player/replacement = new /mob/new_player()
+		replacement.key = key
+		return
+
 	update_Login_details()	//handles setting lastKnownIP and computer_id for use by the ban systems as well as checking for multikeying
 	if(GLOB.join_motd)
 		GLOB.join_motd = GLOB.is_valid_url.Replace(GLOB.join_motd, span_linkify("$1"))