Game crashes when I open a downloaded map

Whenever I open a downloaded map, I always get a game crash and I return to the launcher

What I expected to happen was...:
The map would open, and I could play.

What actually happened was...:
I got a game crash and I return to the launcher

Steps to Reproduce:
1. Start Minecraft (v1.9)
2. Click Singleplayer
3. Open a world that you have downloaded
4. Crash happens