Undetermined nullability Encountered while compiling file:///.../postgrest_builder.dart, contains the type: NeverType(Never%).

[karimegaber]

I am currently working on a Flutter Web app, when I added supabase_flutter package, I got this error:

Launching lib\main.dart on Chrome in debug mode...
Unhandled exception:
Unsupported operation: Undetermined nullability. Encountered while compiling file:///C:/Users/user/AppData/Local/Pub/Cache/hosted/pub.dev/postgrest-2.4.1/lib/src/postgrest_builder.dart, which contains the type: NeverType(Never%).
#0      ProgramCompiler._typeCompilationError (package:dev_compiler/src/kernel/compiler.dart:3678)
#1      ProgramCompiler._newEmitType (package:dev_compiler/src/kernel/compiler.dart:3471)
#2      ProgramCompiler._emitType (package:dev_compiler/src/kernel/compiler.dart:3379)
#3      MappedListIterable.elementAt (dart:_internal/iterable.dart:425)
#4      MappedListIterable.elementAt (dart:_internal/iterable.dart:425)
#5      ListIterator.moveNext (dart:_internal/iterable.dart:354)
#6      InstantiatorGeneratorVisitor.splayNodes (package:dev_compiler/src/js_ast/template.dart:224)
#7      InstantiatorGeneratorVisitor.handleCallOrNew.<anonymous closure> (package:dev_compiler/src/js_ast/template.dart:604)
#8      Template.instantiate (package:dev_compiler/src/js_ast/template.dart:118)
#9      JsBuilder.call (package:dev_compiler/src/js_ast/builder.dart:212)
#10     ProgramCompiler._emitGenericClassType (package:dev_compiler/src/kernel/compiler.dart:3717)
#11     ProgramCompiler._emitClassRef (package:dev_compiler/src/kernel/compiler.dart:3634)
#12     ProgramCompiler._emitConstructorName (package:dev_compiler/src/kernel/compiler.dart:3869)
#13     ProgramCompiler.visitConstructorInvocation (package:dev_compiler/src/kernel/compiler.dart:7058)
#14     ConstructorInvocation.accept (package:kernel/ast.dart:6660)
#15     ProgramCompiler._visitExpression (package:dev_compiler/src/kernel/compiler.dart:4611)
#16     ProgramCompiler.visitReturnStatement (package:dev_compiler/src/kernel/compiler.dart:5182)
#17     ReturnStatement.accept (package:kernel/ast.dart:10159)
#18     ProgramCompiler._visitStatement (package:dev_compiler/src/kernel/compiler.dart:4520)
#19     MappedListIterable.elementAt (dart:_internal/iterable.dart:425)
#20     ListIterator.moveNext (dart:_internal/iterable.dart:354)
#21     new _GrowableList._ofEfficientLengthIterable (dart:core-patch/growable_array.dart:189)
#22     new _GrowableList.of (dart:core-patch/growable_array.dart:150)
#23     new List.of (dart:core-patch/array_patch.dart:39)
#24     SetBase.toList (dart:collection/set.dart:119)
#25     ProgramCompiler.visitBlock (package:dev_compiler/src/kernel/compiler.dart:4701)
#26     Block.accept (package:kernel/ast.dart:9195)
#27     ProgramCompiler._visitStatement (package:dev_compiler/src/kernel/compiler.dart:4520)
#28     ProgramCompiler._emitFunctionScopedBody (package:dev_compiler/src/kernel/compiler.dart:4553)
#29     ProgramCompiler._emitSyncFunctionBody.<anonymous closure> (package:dev_compiler/src/kernel/compiler.dart:4259)
#30     ProgramCompiler._withLetScope (package:dev_compiler/src/kernel/compiler.dart:2829)
#31     ProgramCompiler._withCurrentFunction (package:dev_compiler/src/kernel/compiler.dart:4296)
#32     ProgramCompiler._emitSyncFunctionBody (package:dev_compiler/src/kernel/compiler.dart:4255)
#33     ProgramCompiler._emitFunction (package:dev_compiler/src/kernel/compiler.dart:4060)
#34     ProgramCompiler._emitMethodDeclaration.<anonymous closure> (package:dev_compiler/src/kernel/compiler.dart:2392)
#35     ProgramCompiler._withMethodDeclarationContext (package:dev_compiler/src/kernel/compiler.dart:4323)
#36     ProgramCompiler._emitMethodDeclaration (package:dev_compiler/src/kernel/compiler.dart:2391)
#37     ProgramCompiler._emitClassMethods (package:dev_compiler/src/kernel/compiler.dart:2332)
#38     ProgramCompiler._emitClassDeclaration (package:dev_compiler/src/kernel/compiler.dart:932)
#39     ProgramCompiler._emitClass (package:dev_compiler/src/kernel/compiler.dart:846)
#40     ProgramCompiler._declareBeforeUse (package:dev_compiler/src/kernel/compiler.dart:876)
#41     ProgramCompiler._emitInterfaceType (package:dev_compiler/src/kernel/compiler.dart:3531)
#42     ProgramCompiler._defineClass.emitClassRef (package:dev_compiler/src/kernel/compiler.dart:1355)
#43     ProgramCompiler._defineClass (package:dev_compiler/src/kernel/compiler.dart:1444)
#44     ProgramCompiler._emitClassDeclaration (package:dev_compiler/src/kernel/compiler.dart:941)
#45     ProgramCompiler._emitClass (package:dev_compiler/src/kernel/compiler.dart:846)
#46     ProgramCompiler._declareBeforeUse (package:dev_compiler/src/kernel/compiler.dart:876)
#47     ProgramCompiler._emitInterfaceType (package:dev_compiler/src/kernel/compiler.dart:3531)
#48     ProgramCompiler._defineClass.emitClassRef (package:dev_compiler/src/kernel/compiler.dart:1355)
#49     ProgramCompiler._defineClass (package:dev_compiler/src/kernel/compiler.dart:1444)
#50     ProgramCompiler._emitClassDeclaration (package:dev_compiler/src/kernel/compiler.dart:941)
#51     ProgramCompiler._emitClass (package:dev_compiler/src/kernel/compiler.dart:846)
#52     List.forEach (dart:core-patch/growable_array.dart:416)
#53     ProgramCompiler._emitLibrary (package:dev_compiler/src/kernel/compiler.dart:784)
#54     List.forEach (dart:core-patch/growable_array.dart:416)
#55     ProgramCompiler.emitModule (package:dev_compiler/src/kernel/compiler.dart:505)
#56     IncrementalJavaScriptBundler.compile (package:frontend_server/src/javascript_bundle.dart:223)
#57     FrontendCompiler.writeJavaScriptBundle (package:frontend_server/frontend_server.dart:794)
<asynchronous suspension>
#58     FrontendCompiler.compile (package:frontend_server/frontend_server.dart:654)
<asynchronous suspension>
#59     listenAndCompile.<anonymous closure> (package:frontend_server/frontend_server.dart:1303)
<asynchronous suspension>
Failed to compile application.


Exited (1).

My Code:

class AppSupabaseClient {
  // Client Instance
  SupabaseClient get supabase => Supabase.instance.client;

  // Initialization
  static Future<void> init() async {
    await Supabase.initialize(
      url: Env.supabaseUrl,
      anonKey: Env.supabaseAnonKey,
    );
  }
}

My Versions
Flutter : Flutter 3.19.1
Dart: Dart 3.3.0
Supabase: supabase_flutter: ^2.8.3

Flutter Doctor
[√] Flutter (Channel stable, 3.19.1, on Microsoft Windows [Version 10.0.22621.4317], locale en-US)
[√] Windows Version (Installed version of Windows is version 10 or higher)
[√] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[√] Chrome - develop for the web
[√] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.6.1)
[√] Android Studio (version 2023.1)
[√] IntelliJ IDEA Community Edition (version 2023.1)
[√] VS Code (version 1.96.2)
[√] Connected device (3 available)
[√] Network resources

• No issues found!

[dshukertjr]

I'm guessing this is a bug introduced in Flutter.

[karimegaber]

I'm guessing this is a bug introduced in Flutter.

Can you please clarify more ?