Grass modeling

Hello guys could you give me any advice, please? I am modeling the low poly suburb, just boxy one ( around 20 buildings) I used GIS. The whole Scene is white only the small garden parcel in the middle is colored grass, one textured tree and that’s it. My render viewport works well till I use the advanced setup CHILDREN-SIMPLE. When I render it, after all, it will crash and fall down even my chrome pop up window announce me HARD ERROR and switch off my browser. My computer is laptop Lenovo W520
Thank you.