Trigger not working in build

Hi, I want to display the name of the area in which the player is. I did that using a box collider marked as trigger and a simple code to detect when I'm in the trigger and to get the area name. In the editor, all works fine. But the trigger doesn't work in the build version of the game... (I'm using unity 2D and all my triggers are 2D, all works fine in the editor but not in the build) Can you help me ? Thanks !