Ring is closing instead of going back when opened from notification bar in Android

Issue generated from Tuleap's migration script. Originally submitted by: Prabou MOUTTOU (prabou)

Hello Guys,
Sorry for my english...I am a new French user of Ring.
When I receive a message on my Android (6.0.1) phone, a notification is displayed on the top of the screen (in the notification bar). Then I scroll down this bar and touch the message in order to open Ring.
Then Ring opens and the message is displayed.
Now, when inside this screen, I try to touch the go back arrow, the application closes (instead of showing the conversations history).
For me it's a bug, and sorry if this issue has already been submitted.
I also noticed this issue on Android 5.1.1

Prabou