“Having no mods” is kind of a tricky statement.
While having no external mods that may cause crashes for their operations, the game is inherently using the same structure it uses for mods to add their own content.
There are, for that reason, several things that can crash your game like a mod would, and it will depend on how your system is, not how the game works.
One for example is using bluetooth sound devices. Many games based on UE, specially up to 4 crash because of it, but not related to the exact game thing you do, but because the system itself can “lose” BT devices without warning to the game, and as a trusted but external piece of software that could be related to the “external module” class but not a “mod” as people popularly know it, would crash by trusting there is a place in memory for it to send data, but the actual place was lost when the lost the device. Several games have fixed that problem over the years, this one have not.
For a similar problem, but exact the same reason, having certain features of your your video card enabled, and forcing the game to use external settings unlike its own might make the game crash, again, like it would when using mods, but for a game specific reason. It is not what you do specifically that crashes the game, but operations on what you do.
Those two problems may cause your character to crash when changing armor, walking over a different surface, operating a “burning” item, or many other things that trigger specific things in your system that are not related to the game. So while mine may crash every time I change my armor to a specific piece (because of the sound), yours might crash when you change something from container (because of the sound), but both for the specific same reason that is not related to the game itself.
One of the first things you check when crashing is the log to see what is the “stack” that crashed the game. It often shows you the graph in which the game crashed, and that might tell someone who understands it what exactly crashed.
