Missing constraints on Project locale table

Hello guys

I use Zanata on my private server and I just got a severe issue. I can't see inside my project anymore. You can see it directly here: http://tools.tsubook.net:8080/zanata/explore (try to enter the project Tsubook).

Step to reproduce:
1- Open website
2- Go to explore
3- Click on a project
4- An error message "No errors" appears

Screenshots and logs attached (the error begins at line 350).