[Flutter] How to disable code obfuscation in Flutter release apk?

I have built out a video conferencing app in Flutter by leveraging the agora-rtc-engine (https://pub.dev/packages/agora_rtc_engine)

My app is working perfectly find on the debug version, but it crashes whenever I try to join a room/video conference in the release version of the app. The pub-dev page of the library mentions that it is due to code obfusciation by Flutter. The method they have shown to prevent the crash is outdated (proguard.rules). So, how do I go about fixing it now?

Here is the complete source code : https://github.com/CodeSarthak/Vartalap

Any help is appreciated. Thanks a lot!

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