build_runner produces Severe Error - Null check operator used on a null value

[PuffPastry]

Hi all,

I have been searching for a few hours now and am not able to solve the error. It is kind of a problem related to flutter, but the producing command is flutter pub run build_runner build, which I think is this repo.

The app is still compiling and tests are still passing, even after running dart pub upgrade --nullsafety for all packages except one. The problem occurs after I have added moor and am required to generate some code, thus using the above command.

• Dart SDK Version (dart --version)
  Dart SDK version: 2.13.0 (stable) (Wed May 12 12:45:49 2021 +0200) on "windows_x64"

• What package(s) from this repo you are using, and the version
  build_runner: ^2.0.3

• What builder(s) you are using (or writing yourself). Try to give a short summary of what they do.
  moor_generator: ^4.3.0
  mockito: ^5.0.8

flutter pub run build_runner build -v

Output:

[ +54 ms] executing: [C:\flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[ +179 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[ +1 ms] b22742018b3edf16c6cadd7b76d9db5e7f9064b5
[ ] executing: [C:\flutter/] git tag --points-at b22742018b3edf16c6cadd7b76d9db5e7f9064b5
[ +180 ms] Exit code 0 from: git tag --points-at b22742018b3edf16c6cadd7b76d9db5e7f9064b5
[ ] 2.2.0
[ +4 ms] executing: [C:\flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[ +153 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[ ] origin/stable
[ ] executing: [C:\flutter/] git ls-remote --get-url origin
[ +147 ms] Exit code 0 from: git ls-remote --get-url origin
[ ] https://github.com/flutter/flutter.git
[ +222 ms] executing: [C:\flutter/] git rev-parse --abbrev-ref HEAD
[ +154 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[ ] stable
[ +95 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[ +3 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[ +54 ms] Artifact Instance of 'MaterialFonts' is not required, skipping update.
[ ] Artifact Instance of 'GradleWrapper' is not required, skipping update.
[ ] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[ ] Artifact Instance of 'FlutterSdk' is not required, skipping update.
[ ] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[ ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'FontSubsetArtifacts' is not required, skipping update.
[ ] Artifact Instance of 'PubDependencies' is not required, skipping update.
[ +21 ms] Using C:\flutter.pub-cache for the pub cache.
[ ] executing: C:\flutter\bin\cache\dart-sdk\bin\pub.bat run build_runner build -v
[INFO] Entrypoint:Generating build script...
[INFO] Entrypoint:Generating build script completed, took 306ms

[WARNING] Bootstrap:
Invalidated precompiled build script due to missing asset graph.
[INFO] Bootstrap:Precompiling build script......
[INFO] Bootstrap:Precompiling build script... completed, took 1.1s

[INFO] BuildDefinition:Initializing inputs
[INFO] BuildDefinition:Building new asset graph...
[INFO] BuildDefinition:Building new asset graph completed, took 751ms

[INFO] BuildDefinition:Checking for unexpected pre-existing outputs....
[INFO] BuildDefinition:Checking for unexpected pre-existing outputs. completed, took 1ms

[INFO] Build:Running build...
[INFO] Heartbeat:1.0s elapsed, 3/19 actions completed.
[INFO] Heartbeat:2.1s elapsed, 3/19 actions completed.
[INFO] Heartbeat:3.2s elapsed, 3/19 actions completed.
[INFO] Heartbeat:4.2s elapsed, 9/25 actions completed.
[INFO] Heartbeat:9.9s elapsed, 12/28 actions completed.
[INFO] Heartbeat:11.0s elapsed, 36/52 actions completed.
[SEVERE] mockito:mockBuilder on lib/core/app.dart:

Null check operator used on a null value
#0 LinkedElementFactory.isLibraryUri (package:analyzer/src/summary2/linked_element_factory.dart:418:48)
dart-lang/build#1 LibraryContext.isLibraryUri (package:analyzer/src/dart/analysis/library_context.dart:95:27)
dart-lang/build#2 LibraryAnalyzer._isLibrarySource (package:analyzer/src/dart/analysis/library_analyzer.dart:511:25)
dart-lang/build#3 LibraryAnalyzer._resolveDirectives (package:analyzer/src/dart/analysis/library_analyzer.dart:552:36)
dart-lang/build#4 LibraryAnalyzer.analyzeSync (package:analyzer/src/dart/analysis/library_analyzer.dart:128:5)
dart-lang/build#5 LibraryAnalyzer.analyze (package:analyzer/src/dart/analysis/library_analyzer.dart:105:12)
dart-lang/build#6 AnalysisDriver._computeAnalysisResult. (package:analyzer/src/dart/analysis/driver.dart:1590:63)
dart-lang/build#7 PerformanceLog.run (package:analyzer/src/dart/analysis/performance_logger.dart:32:15)
dart-lang/build#8 AnalysisDriver._computeAnalysisResult (package:analyzer/src/dart/analysis/driver.dart:1565:20)
dart-lang/build#9 AnalysisDriver._computeErrors (package:analyzer/src/dart/analysis/driver.dart:1644:26)
dart-lang/build#10 AnalysisDriver.performWork (package:analyzer/src/dart/analysis/driver.dart:1266:20)
dart-lang/build#11 AnalysisDriverScheduler._run (package:analyzer/src/dart/analysis/driver.dart:2296:24)

package:analyzer/src/dart/analysis/driver.dart 1619:9 AnalysisDriver._computeAnalysisResult.
package:analyzer/src/dart/analysis/performance_logger.dart 32:15 PerformanceLog.run
package:analyzer/src/dart/analysis/driver.dart 1565:20 AnalysisDriver._computeAnalysisResult
package:analyzer/src/dart/analysis/driver.dart 1644:26 AnalysisDriver._computeErrors
package:analyzer/src/dart/analysis/driver.dart 1266:20 AnalysisDriver.performWork
package:analyzer/src/dart/analysis/driver.dart 2296:24 AnalysisDriverScheduler._run

[INFO] Heartbeat:12.9s elapsed, 40/56 actions completed.
[INFO] Heartbeat:14.0s elapsed, 40/56 actions completed.
[INFO] Heartbeat:15.1s elapsed, 40/56 actions completed.

I have tried the command after removing mockito, but then the error appears with moor_generator, with the same stack trace.

Any and all help is greatly appreciated!

[jakemac53]

This looks like it is happening inside the analyzer package, can you confirm you are on the latest version of that (1.5.0)? I know that some similar issues have been fixed.

[PuffPastry]

Yes, I am. From pubspec.lock:

analyzer:
dependency: transitive
description:
name: analyzer
url: "https://pub.dartlang.org"
source: hosted
version: "1.5.0"
analyzer_plugin_fork:
dependency: transitive
description:
name: analyzer_plugin_fork
url: "https://pub.dartlang.org"
source: hosted
version: "0.5.1"

[PuffPastry]

This workaround solves it:

#46035 (comment)

Waiting on new release, as per this thread: #45823