Webstorm/ IntelliJ loses keyboard input in Ubuntu

Edit : Several month after, issue isn't investigated et at jetbrains. Please vote for this issue so devs can start working on it ! 

Sometimes IntelliJ loses input from keyboard in Ubuntu 14.04. I've seen people complain about it as well with PhpStorm and IntelliJ.

Symptom : mouse clicks and menu work as expected, but no keyboard input is accepted and I must restart Webstorm to make it work again.

Solution : restart the ibus service in a terminal :

sudo ibus restart

For latin keyboard people, this switched my keyboard from AZERTY to QWERTY. I had to enter the following command to make it AZERTY again.

setxkbmap fr

Hope this helps.