Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

NullReferenceException

See original GitHub issue

** Just the error and it’s stack trace should be enough **

Unhandled exception. System.ArgumentNullException: Value cannot be null. (Parameter 'key')
   at System.Collections.Generic.Dictionary`2.FindValue(TKey key)
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at Stryker.Core.Compiling.RollbackProcess.Start(CSharpCompilation compiler, ImmutableArray`1 diagnostics, Boolean lastAttempt, Boolean devMode) in /_/src/Stryker.Core/Stryker.Core/Compiling/RollbackProcess.cs:line 43
   at Stryker.Core.Compiling.CsharpCompilingProcess.TryCompilation(Stream ms, Stream symbolStream, CSharpCompilation compilation, EmitResult previousEmitResult, Boolean lastAttempt, Int32 retryCount) in /_/src/Stryker.Core/Stryker.Core/Compiling/CsharpCompilingProcess.cs:line 135
   at Stryker.Core.Compiling.CsharpCompilingProcess.Compile(IEnumerable`1 syntaxTrees, Stream ilStream, Stream symbolStream) in /_/src/Stryker.Core/Stryker.Core/Compiling/CsharpCompilingProcess.cs:line 83
   at Stryker.Core.MutationTest.CsharpMutationProcess.CompileMutations() in /_/src/Stryker.Core/Stryker.Core/MutationTest/CsharpMutationProcess.cs:line 89
   at Stryker.Core.MutationTest.CsharpMutationProcess.Mutate() in /_/src/Stryker.Core/Stryker.Core/MutationTest/CsharpMutationProcess.cs:line 81
   at Stryker.Core.MutationTest.MutationTestProcess.Mutate() in /_/src/Stryker.Core/Stryker.Core/MutationTest/MutationTestProcess.cs:line 89
   at Stryker.Core.Initialisation.ProjectMutator.MutateProject(StrykerOptions options, IReporter reporters, IEnumerable`1 solutionProjects) in /_/src/Stryker.Core/Stryker.Core/Initialisation/ProjectMutator.cs:line 41
   at Stryker.Core.Initialisation.ProjectOrchestrator.MutateProjects(StrykerOptions options, IReporter reporters)+MoveNext() in /_/src/Stryker.Core/Stryker.Core/Initialisation/ProjectOrchestrator.cs:line 71
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Stryker.Core.StrykerRunner.RunMutationTest(IStrykerInputs inputs, ILoggerFactory loggerFactory, IProjectOrchestrator projectOrchestrator) in /_/src/Stryker.Core/Stryker.Core/StrykerRunner.cs:line 58
   at Stryker.CLI.StrykerCli.RunStryker(IStrykerInputs inputs) in /_/src/Stryker.CLI/Stryker.CLI/StrykerCLI.cs:line 93
   at Stryker.CLI.StrykerCli.<>c__DisplayClass10_0.<Run>b__0() in /_/src/Stryker.CLI/Stryker.CLI/StrykerCLI.cs:line 68
   at McMaster.Extensions.CommandLineUtils.CommandLineApplication.<>c__DisplayClass143_0.<OnExecute>b__0(CancellationToken _)
   at McMaster.Extensions.CommandLineUtils.CommandLineApplication.ExecuteAsync(String[] args, CancellationToken cancellationToken)
   at McMaster.Extensions.CommandLineUtils.CommandLineApplication.Execute(String[] args)
   at Stryker.CLI.StrykerCli.Run(String[] args) in /_/src/Stryker.CLI/Stryker.CLI/StrykerCLI.cs:line 74
   at Stryker.CLI.Program.Main(String[] args) in /_/src/Stryker.CLI/Stryker.CLI/Program.cs:line 14

Issue Analytics

State:
Created 7 months ago
Comments:8 (3 by maintainers)

Top GitHub Comments

1reaction

causa-primacommented, Mar 27, 2023

I can confirm it’s fixed in 3.7.1. Thanks for the quick response!

0reactions

rouke-broersmacommented, Feb 22, 2023

Yes this issue was recently introduced, I think I’ll reintroduce the previous method of resolving the embedded resources and also keep the new implementation since the previous method seems to work fine for a lot more people than I thought.

Top Results From Across the Web

NullReferenceException Class (System)

A NullReferenceException exception is thrown by a method that is passed null . Some methods validate the arguments that are passed to them....

c# - What is a NullReferenceException, and how do I fix it?

The runtime throwing a NullReferenceException always means the same thing: you are trying to use a reference, and the reference is not ...

What is a Null Reference Exception?

A NullReferenceException happens when you try to access a reference variable that isn't referencing any object. If a reference variable ...

Object Reference Not Set to an Instance of an Object

This infamous and dreaded error message happens when you get a NullReferenceException. This exception is thrown when you try to access a member—for...

What is NullReferenceException in C#? - Code Maze

In C#, a NullReferenceException occurs when we try to access a variable whose value has not been set or has been set to...