Google Chrome Invisible

Hello, I have been experiencing this for now, 2 months and can't figure out to fix it. Whenever I drop something on my keyboard by accident and it presses Command Q, it asks me if I want to close the site that needs permission to close. I cancel it then Google Chrome goes invisible. I don't mean 1 window but all the windows that I have opened. I can see the cursor changing when I hover stuff (even I cannot even see) so the window is still open.

What should I do?

Here's my specs so you can find me a way to fix it.

iMac (27-inch, Late 2012)

Processor : 2.9 GHz Intel Core i5

Memory : 8 GB 1600 MHz DDR3

Graphics : NVIDIA GeForce GTX 660M 512 MB

Hope you can help! - Hanly Wijaya