Everything fades away final render (Cycles)

Hey there!
I have no clue what causes this problem, but it is very very annoying.

From frames 37-39, all objects fade out and don’t come back. I literally have no idea why this happens, and can see no possible way I would have intentionally enabled this.

Here is the file:
https://www.mediafire.com/?omqta52pwdjfl2d
Ben Shoots.zip (561 KB)I hope it’s just something stupid I’ve done ;D

Fixed it by copying everything into a new blender save.