Null check operator on Android in Release Mode

[akmjenkins]

Works fine in debug mode, when I run it in release mode I get this trace from await FlutterConfig.loadEnvVariables()

EDIT: Was originally running v 1.0.8. Upgraded to 2.0.0, issue exists (for me) in both

E/flutter (18251): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: Null check operator used on a null value
E/flutter (18251): #0      MethodChannel.binaryMessenger (package:flutter/src/services/platform_channel.dart:142)
E/flutter (18251): #1      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:148)
E/flutter (18251): #2      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:331)
E/flutter (18251): #3      MethodChannel.invokeMapMethod (package:flutter/src/services/platform_channel.dart:358)
E/flutter (18251): #4      FlutterConfig.loadEnvVariables (package:flutter_config/flutter_config.dart:21)

Mandatory flutter doctor -v

[✓] Flutter (Channel stable, 2.2.0, on macOS 11.3.1 20E241 darwin-x64, locale en-CA)
    • Flutter version 2.2.0 at /Users/adev/dev/flutter
    • Framework revision b22742018b (12 days ago), 2021-05-14 19:12:57 -0700
    • Engine revision a9d88a4d18
    • Dart version 2.13.0

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at /Users/adev/Library/Android/sdk
    • Platform android-30, build-tools 30.0.3
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.5, Build version 12E262
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.2)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264)

[✓] VS Code (version 1.56.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.22.0

[✓] Connected device (2 available)
    • SM P610 (mobile) • R52R305DGZH • android-arm64  • Android 10 (API 29)
    • Chrome (web)     • chrome      • web-javascript • Google Chrome 90.0.4430.212

Also worth pointing out that when I build, I get these gradle warnings - not sure if they are related or not to my issue:

w: Runtime JAR files in the classpath should have the same version. These files were found in the classpath:
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk7/1.4.21/26b6082f9296911bdcb8e72a7cc68692c7025a03/kotlin-stdlib-jdk7-1.4.21.jar (version 1.4)
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.4.21/4a668382d7c38688d3490afde93b6a113ed46698/kotlin-stdlib-1.4.21.jar (version 1.4)
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.4.21/7f48a062aa4b53215998780f7c245a4276828e1d/kotlin-stdlib-common-1.4.21.jar (version 1.4)
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-reflect/1.3.0/6fd129fd9ba8581f2cb9c58bfd431dda4ee0457e/kotlin-reflect-1.3.0.jar (version 1.3)
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk7/1.3.70/95aee922bc2a0fff3b7bfa1b6503ff0afe38264a/kotlin-stdlib-jdk7-1.3.70.jar (version 1.3)
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk8/1.4.31/e613be5465ef1e6fd0468707690b7ebf625ea2fe/kotlin-stdlib-jdk8-1.4.31.jar (version 1.4)
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.3.70/e5d97e25bb5b30dcfc022ec1c8f3959a875257fb/kotlin-stdlib-1.3.70.jar (version 1.3)
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk7/1.4.31/84ce8e85f6e84270b2b501d44e9f0ba6ff64fa71/kotlin-stdlib-jdk7-1.4.31.jar (version 1.4)
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.3.50/3d9cd3e1bc7b92e95f43d45be3bfbcf38e36ab87/kotlin-stdlib-common-1.3.50.jar (version 1.3)
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk7/1.3.50/50ad05ea1c2595fb31b800e76db464d08d599af3/kotlin-stdlib-jdk7-1.3.50.jar (version 1.3)
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.3.50/b529d1738c7e98bbfa36a4134039528f2ce78ebf/kotlin-stdlib-1.3.50.jar (version 1.3)
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk7/1.3.61/70dffc5f8ac5ea7c34f30deac5b9d8b1d48af066/kotlin-stdlib-jdk7-1.3.61.jar (version 1.3)
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.3.61/4702105e97f7396ae41b113fdbdc180ec1eb1e36/kotlin-stdlib-1.3.61.jar (version 1.3)
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.3.61/65abb71d5afb850b68be03987b08e2c864ca3110/kotlin-stdlib-common-1.3.61.jar (version 1.3)
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.4.31/a58e0fb9812a6a93ca24b5da75e4b5a0cb89c957/kotlin-stdlib-1.4.31.jar (version 1.4)
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.4.31/6dd50665802f54ba9bc3f70ecb20227d1bc81323/kotlin-stdlib-common-1.4.31.jar (version 1.4)
    /Users/adev/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.3.70/3fa8dd6c896d635e78201e5e811545f3846dec04/kotlin-stdlib-common-1.3.70.jar (version 1.3)
w: Consider providing an explicit dependency on kotlin-reflect 1.4 to prevent strange errors
w: Some runtime JAR files in the classpath have an incompatible version. Consider removing them from the classpath

[edTheGuy00]

Hello, if you are using Proguard, you will need to add the rules to avoid the obfuscator from stripping away needed classes. It is mentioned on the Android Setup Guide

[akmjenkins]

@edTheGuy00 thanks for the reply!

On my debugging journey before I posted this issue, I added android/app/proguard-rules.pro to my project with:

-keep class com.myappname.suffix.BuildConfig { *; }

And it did not solve my issue.

[edTheGuy00]

Just to double check again, You replaced com.myappname.suffix with YOUR app name correct? For example, in my app I would have

-keep class com.byneapp.coolApp.BuildConfig { *; }

Secondly, I'm not 100% sure that is correct, I think you might also need to add the FlutterConfigPlugin class.

-keep class com.byneapp.flutter_config.FlutterConfigPlugin { *; }

Can you check for me? I normally just skip using pro-guard alltogether as I normally have to manually add almost every single Native Class into it, which makes it pretty useless for me and only saves a few KB on APK size.

[akmjenkins]

Just to double check again, You replaced com.myappname.suffix with YOUR app name correct?

Yes.

I've also added:

-keep class com.myappname.flutter_config.FlutterConfigPlugin { *; }

with no luck.

How can I disable proguard? I noticed in my gradle.properties file there's this android.enableR8=true and I was starting to wondering if R8 had anything to do with this?

[abdullah432]

Same issue, no luck so far

[developerjamiu]

According to the documentation here, if you use applicationIdSuffix i.e. com.yourorg.mobile.suffix that is different from the package name indicated in your AndroidManifest.xml you need to add line in your android/app/build.gradle file.

defaultConfig {
    ...
    resValue "string", "build_config_package", "YOUR_PACKAGE_NAME_IN_ANDROIDMANIFEST.XML"
}