It could have to do with:
https://github.com/lolluslollus/lollo_freestyle_train_station_1/issues/20

I don't know, I don't use this mod. The freestyle station does not receive an automatic name like ordinary stations, so it always becomes "New Station". It's probably best to teach this mod to ignore freestyle stations.

@lollus:
I just witnessed that a station was renamed from "New Station" to the name of the nearest industry after a couple of seconds.

But you are most likely right, because after loading the save I did prior placing the markers I just waited a little bit after the station was renamed, manually renamed it by myself and then continued adding markers.
It still crashed.

Does it crash without any other mods enabled? If so, try and send me a savegame with swisstransfer.

Thanks for the information - I'll take a look at this when I have a bit more time, but it may take a while and I'm not sure if there can be a real solution to knowing which things do not like being renamed, or what it would look like.

You can check the construction file name: if it is 'station/rail/lollo_freestyle_train_station/station.con' then skip.

I have looked at this and could not reproduce the issue. In fact, my mod does not react at all to events from the freestyle station mod, because that mod does not send standard constructionBuilder builder.apply GUI events -- at least, it did not while I tested it.

You can test that yourself by adding a "debugPrint(entity)" at line 49: https://github.com/Konrad2023/SmartStationNaming/blob/master/res/config/game_script/smart_station_naming.lua#L49 and observe which events actually even trigger my mod's logic.