I just encountered a reproducable game crash in version 1.1.8.
My setup:
Factorio 1.1.8 + 3 additional mods installed but not activated for my savegame.
What did I do:
Renaming a train station to a name that is already used by my trains.
What did happen:
Game froze, error dialog pointing to the logs folder appeared, on closing the error dialog the game window also closed.
Expected behavior:
Train station is renamed and trains with it in their schedule start using this station too.
Steps to reproduce:
1. Build a train station
2. Add this staion to a trains schedule
3. Rename the train station to some other name (in my case by putting a blueprint over it that uses a default name)
4. Rename the train station back to the original name
5. Error dialog appears and game closes
Workaround:
Before renaming remove the train stop from all trains.
I attached the log and dump file.
Hope this helps hunting

Regards,
Dschinghis