You're creating an infinite evaluation loop.
You can't have a tySelect referencing the particles on your Torus if your particles are being generated on the Torus...because tyFlow can't import the Torus until its modifier stack has been evaluated, and its modifier stack is dependent on the tyFlow when you add it inside a tySelect.
Create a clone of your first Torus to use with tySelect. Technically it should be warning you when you create a loop like that instead of crashing...I'll look into that.
You can't have a tySelect referencing the particles on your Torus if your particles are being generated on the Torus...because tyFlow can't import the Torus until its modifier stack has been evaluated, and its modifier stack is dependent on the tyFlow when you add it inside a tySelect.
Create a clone of your first Torus to use with tySelect. Technically it should be warning you when you create a loop like that instead of crashing...I'll look into that.