Everytime I toggle Guake it adds an extra prompt line

I am using Guake in Ubuntu 14.10. I have a setup where Guake starts at startup and I use `` to toggle visibility.

The issue is every-time I toggle visibility guake adds an extra line of prompt. For example
after startup if I press 4 times my Guake terminal shows :

 

$

$

$

$

where it should be showing just a single prompt `$`.
Other guake functionality is fine. I cloned the latest build from github and followed the installation instructions. In case it is important I couldn't complete the `./dev.sh --install` script but I could use
./autogen.sh && make... ` way.