Screenshot bug

When I try to take a screnshot in the creative inventory if i press the screenshot button (F2) Minecraft doesn't take any screenshot.

What I expected to happen was:
When i press F2 to take a screenshot in the creative inventory, Minecraft have to take the screnshot.

What actually happened was:
Instead, Minecraft doesn't take any screenshot in the creative inventory.

Steps to Reproduce:
1. Open the creative inventory.
2. Press F2 (Or whatever key you've set to take screenshots).
3. Notice that it doesn't take any screenshot.