Android App crashes in release mode with obfuscation enabled in proguard

I have written one hybrid app which is using react-native-svg to render svg images in react-native views. Everything works perfectly. Today, When I created release apk for my app and deployed it to an emulator it crashed with an error: E/AndroidRuntime: FATAL EXCEPTION: mqt_native_modules Process: com.example.packgename, PID: 8574 java.lang.IllegalStateException: java.lang.NoSuchFieldException: mFill at com.horcrux.svg.q.a(Unknown Source:78) at com.horcrux.svg.i$1.a(Unknown Source:9) at com.horcrux.svg.aa.a(Unknown Source:22) at com.horcrux.svg.i.b(Unknown Source:14) at com.horcrux.svg.i.a(Unknown Source:10) at com.horcrux.svg.t.a(Unknown Source:104) at com.horcrux.svg.t.c(Unknown Source:25) at com.horcrux.svg.t.a(Unknown Source:7) at com.facebook.react.uimanager.u.a(Unknown Source:5) at com.facebook.react.uimanager.ag.a(Unknown Source:56) at com.facebook.react.uimanager.ag.a(Unknown Source:34) at com.facebook.react.uimanager.ag.a(Unknown Source:34) at com.facebook.react.uimanager.ag.a(Unknown Source:34) at com.facebook.react.uimanager.ag.a(Unknown Source:34) at com.facebook.react.uimanager.ag.a(Unknown Source:34) at com.facebook.react.uimanager.ag.a(Unknown Source:34) at com.facebook.react.uimanager.ag.a(Unknown Source:34) at com.facebook.react.uimanager.ag.a(Unknown Source:34) at com.facebook.react.uimanager.ag.a(Unknown Source:34) at com.facebook.react.uimanager.ag.a(Unknown Source:34) at com.facebook.react.uimanager.ag.a(Unknown Source:34) at com.facebook.react.uimanager.ag.a(Unknown Source:34) at com.facebook.react.uimanager.ag.d(Unknown Source:83) at com.facebook.react.uimanager.ag.e(Unknown Source:17) at com.facebook.react.uimanager.UIManagerModule.onBatchComplete(Unknown Source:27) at com.facebook.react.bridge.z.d(Unknown Source:30) at com.facebook.react.bridge.CatalystInstanceImpl$a.onBatchComplete(Unknown Source:14) at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method) at android.os.Handler.handleCallback(Handler.java:789) at android.os.Handler.dispatchMessage(Handler.java:98) at com.facebook.react.bridge.queue.a.dispatchMessage(Unknown Source:0) at android.os.Looper.loop(Looper.java:164) at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(Unknown Source:16) at java.lang.Thread.run(Thread.java:764) Caused by: java.lang.NoSuchFieldException: mFill at java.lang.Class.getField(Class.java:1601) at com.horcrux.svg.q.a(Unknown Source:41) at com.horcrux.svg.i$1.a(Unknown Source:9)  at com.horcrux.svg.aa.a(Unknown Source:22)  at com.horcrux.svg.i.b(Unknown Source:14)  at com.horcrux.svg.i.a(Unknown Source:10)  at com.horcrux.svg.t.a(Unknown Source:104)  at com.horcrux.svg.t.c(Unknown Source:25)  at com.horcrux.svg.t.a(Unknown Source:7)  at com.facebook.react.uimanager.u.a(Unknown Source:5)  at com.facebook.react.uimanager.ag.a(Unknown Source:56)  at com.facebook.react.uimanager.ag.a(Unknown Source:34)  at com.facebook.react.uimanager.ag.a(Unknown Source:34)  at com.facebook.react.uimanager.ag.a(Unknown Source:34)  at com.facebook.react.uimanager.ag.a(Unknown Source:34)  at com.facebook.react.uimanager.ag.a(Unknown Source:34)  at com.facebook.react.uimanager.ag.a(Unknown Source:34)  at com.facebook.react.uimanager.ag.a(Unknown Source:34)  at com.facebook.react.uimanager.ag.a(Unknown Source:34)  at com.facebook.react.uimanager.ag.a(Unknown Source:34)  at com.facebook.react.uimanager.ag.a(Unknown Source:34)  at com.facebook.react.uimanager.ag.a(Unknown Source:34)  at com.facebook.react.uimanager.ag.a(Unknown Source:34)  at com.facebook.react.uimanager.ag.d(Unknown Source:83)  at com.facebook.react.uimanager.ag.e(Unknown Source:17)  at com.facebook.react.uimanager.UIManagerModule.onBatchComplete(Unknown Source:27)  at com.facebook.react.bridge.z.d(Unknown Source:30)  at com.facebook.react.bridge.CatalystInstanceImpl$a.onBatchComplete(Unknown Source:14)  at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method)  at android.os.Handler.handleCallback(Handler.java:789)  at android.os.Handler.dispatchMessage(Handler.java:98)  at com.facebook.react.bridge.queue.a.dispatchMessage(Unknown Source:0)  at android.os.Looper.loop(Looper.java:164)  at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(Unknown Source:16)  at java.lang.Thread.run(Thread.java:764) 

I see this problem only when I comment -dontobfuscate from proguard-rule.pro file. I want to obfuscate my apk code(I can’t controll it.). I am using proguard file similar to the one shown in this example, https://github.com/magicismight/react-native-svg-example/blob/cfb788461efae0de367c97aadcc829cdeb959a8d/android/app/proguard-rules.pro

Any suggestion on , how can I stop my app from crashing without enabling -dontobfuscate in proguard-rules file?

[chyi13]

Try adding -keep public class com.horcrux.svg.** {*;}

[czanella]

I just ran into this same issue, and the solution worked for me too. Thanks a million!! 😃