Can't get blocks from creative menu!

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
Well, i tried to get blocks from the creative menu, and it just disappeared...
What actually happened was...:
Describe what happened here
It just disappeared..
Steps to Reproduce:
1. Push E in Creative..
2. Click an Item
3. It will disappears!!