Yes that's a possibility, but you can't password a public server, or it would be empty all the time, and not just for this map, but for every map.It crashes because randumbs join and they don't have the map, so they crash the server.
Simple solution: Password the server.
So its not as simple a solution as you think, in fact its not a solution at all.
If players are crashing the server coz they don't have the map, then why isn't Ogledow crashing all the time?
So what's the difference between Ogledow and Butovo?, well as a server admin the only difference i can see is that Ogledow had two files to install, and Butovo only had one, but i'm not a modder so i don't know if this means something or nothing.