No graph displayed on iOS Released

[brakzog]

Hello, I have a strange issue with your library. During my development, everything works well and I can test and see a graph generated with your library. But when I have tried to generate mat application and installing it to my iPhone using TestFlight, trying to display the graph will only show me blank screen like in this picture :

Instead as you can see below everything works well in debug mode :

Do you have any idea what can cause this issue and how to fix it?
Thanks in advance