Flutter firebase exception on ios testflight

Hi, I have an app that uses a firestore database, throughout testing I had no problems. However, I released my app and it crashes all the time.when i distribute my app to testflight this will working on the 3 ios devices with same version but the app is not working on one device which have also a same version of ios. when i open the app the app will crash and not open.

Here is a crash report I have. I am struggling to find resources online on how to interpret it but no solution found, so any help would be appreciated.

Thanks so much for any help,

Flutter firebase exception on ios testflight
 
 
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