Diagnostic analyzer runner NullReferenceException in NullableWalker.CheckCallReceiver on opening a large project

**Version Used**: 17.14.19

```
StreamJsonRpc.RemoteInvocationException: Object reference not set to an instance of an object.
at StreamJsonRpc.JsonRpc.d__156`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.CodeAnalysis.Remote.BrokeredServiceConnection`1.d__18`1.MoveNext()
RPC server exception:
System.NullReferenceException: Object reference not set to an instance of an object.
at Microsoft.CodeAnalysis.CSharp.NullableWalker.CheckCallReceiver(BoundExpression receiverOpt, TypeWithState receiverType, MethodSymbol method)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitCall(BoundCall node)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitExpressionOrPatternWithoutStackGuard(BoundNode node)
at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.VisitExpressionOrPatternWithStackGuard(Int32& recursionDepth, BoundNode node)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, Boolean useLegacyWarnings, Boolean trackMembers, AssignmentKind assignmentKind, Boolean delayCompletionForTargetType)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.g__visitMemberAssignment|180_8(BoundAssignmentOperator node, Int32 containingSlot, Symbol symbol, Boolean delayCompletionForType, Func`2 conversionCompletion)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.g__visitMemberInitializer|180_0(Int32 containingSlot, TypeSymbol containingType, BoundAssignmentOperator node, Boolean delayCompletionForType)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitObjectCreationInitializer(Int32 containingSlot, TypeSymbol containingType, BoundObjectInitializerExpressionBase node, Boolean delayCompletionForType)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitWithExpression(BoundWithExpression withExpr)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitExpressionOrPatternWithoutStackGuard(BoundNode node)
at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.VisitExpressionOrPatternWithStackGuard(Int32& recursionDepth, BoundNode node)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.g__visitConditionalOperand|219_2(LocalState state, BoundExpression operand)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitConditionalOperatorCore(BoundExpression node, Boolean isRef, BoundExpression condition, BoundExpression originalConsequence, BoundExpression originalAlternative)
at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitConditionalOperator(BoundConditionalOperator node)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitExpressionOrPatternWithoutStackGuard(BoundNode node)
at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.VisitExpressionOrPatternWithStackGuard(Int32& recursionDepth, BoundNode node)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, Boolean useLegacyWarnings, Boolean trackMembers, AssignmentKind assignmentKind, Boolean delayCompletionForTargetType)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.g__visitMemberAssignment|180_8(BoundAssignmentOperator node, Int32 containingSlot, Symbol symbol, Boolean delayCompletionForType, Func`2 conversionCompletion)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.g__visitMemberInitializer|180_0(Int32 containingSlot, TypeSymbol containingType, BoundAssignmentOperator node, Boolean delayCompletionForType)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitObjectCreationInitializer(Int32 containingSlot, TypeSymbol containingType, BoundObjectInitializerExpressionBase node, Boolean delayCompletionForType)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitWithExpression(BoundWithExpression withExpr)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitExpressionOrPatternWithoutStackGuard(BoundNode node)
at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.VisitExpressionOrPatternWithStackGuard(BoundNode node)
at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.VisitExpressionOrPatternWithStackGuard(Int32& recursionDepth, BoundNode node)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitReturnStatement(BoundReturnStatement node)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitStatementsWithLocalFunctions(BoundBlock block)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitBlock(BoundBlock node)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitStatement(BoundStatement statement)
at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitStatementListWorker(BoundStatementList node)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitSwitchSection(BoundSwitchSection node, Boolean isLastSection)
at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitSwitchStatement(BoundSwitchStatement node)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitStatementsWithLocalFunctions(BoundBlock block)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitBlock(BoundBlock node)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.Visit(BoundNode node)
at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitMethodBodies(BoundBlock blockBody, BoundBlock expressionBody)
at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitNonConstructorMethodBody(BoundNonConstructorMethodBody node)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.Scan(Boolean& badRegion)
at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.Analyze(Boolean& badRegion, Optional`1 initialState)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.Analyze(NullableWalker walker, Symbol symbol, DiagnosticBag diagnostics, Optional`1 initialState, Builder snapshotBuilderOpt, Boolean requiresAnalysis)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.Analyze(CSharpCompilation compilation, Symbol symbol, BoundNode node, Binder binder, Conversions conversions, DiagnosticBag diagnostics, Boolean useConstructorExitWarnings, Nullable`1 getterNullResilienceData, Boolean useDelegateInvokeParameterTypes, Boolean useDelegateInvokeReturnType, MethodSymbol delegateInvokeMethodOpt, VariableState initialState, MethodSymbol baseOrThisInitializer, Builder analyzedNullabilityMapOpt, Builder snapshotBuilderOpt, ArrayBuilder`1 returnTypesOpt, Boolean getFinalNullableState, VariableState& finalNullableState, Boolean requiresAnalysis)
at Microsoft.CodeAnalysis.CSharp.NullableWalker.AnalyzeWithSemanticInfo(CSharpCompilation compilation, Symbol symbol, BoundNode node, Binder binder, VariableState initialState, DiagnosticBag diagnostics, Boolean createSnapshots, Boolean requiresAnalysis)
at Microsoft.CodeAnalysis.CSharp.MethodCompiler.BindMethodBody(MethodSymbol method, TypeCompilationState compilationState, BindingDiagnosticBag diagnostics, Boolean includeInitializersInBody, BoundNode initializersBody, Boolean reportNullableDiagnostics, ImportChain& importChain, Boolean& originalBodyNested, Boolean& prependedDefaultValueTypeConstructorInitializer, InitialState& forSemanticModel)
at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileMethod(MethodSymbol methodSymbol, Int32 methodOrdinal, ProcessedFieldInitializers& processedInitializers, SynthesizedSubmissionFields previousSubmissionFields, TypeCompilationState compilationState)
at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileNamedType(NamedTypeSymbol containingType)
at Microsoft.CodeAnalysis.CSharp.MethodCompiler.<>c__DisplayClass25_0.b__0()
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
--- End of stack trace from previous location ---
at Microsoft.CodeAnalysis.CSharp.MethodCompiler.WaitForWorkers()
at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileMethodBodies(CSharpCompilation compilation, PEModuleBuilder moduleBeingBuiltOpt, Boolean emittingPdb, Boolean hasDeclarationErrors, Boolean emitMethodBodies, BindingDiagnosticBag diagnostics, Predicate`1 filterOpt, CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.CSharp.CSharpCompilation.GetDiagnosticsForAllMethodBodies(BindingDiagnosticBag diagnostics, Boolean doLowering, CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.CSharp.CSharpCompilation.GetDiagnosticsWithoutSeverityFiltering(CompilationStage stage, Boolean includeEarlierStages, BindingDiagnosticBag builder, Predicate`1 symbolFilter, CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.CSharp.CSharpCompilation.GetDiagnostics(CompilationStage stage, Boolean includeEarlierStages, DiagnosticBag diagnostics, Predicate`1 symbolFilter, CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.CSharp.CSharpCompilation.GetDiagnostics(CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.Diagnostics.CompilationWithAnalyzers.ComputeAnalyzerDiagnosticsAsync(AnalysisScope analysisScope, CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.Diagnostics.CompilationWithAnalyzers.GetAnalysisResultCoreAsync(ImmutableArray`1 analyzers, CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.Diagnostics.CompilationWithAnalyzers.GetAnalysisResultAsync(CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.Diagnostics.CompilationWithAnalyzersPair.GetAnalysisResultAsync(CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.Diagnostics.Extensions.GetAnalysisResultAsync(CompilationWithAnalyzersPair compilationWithAnalyzers, DocumentAnalysisScope documentAnalysisScope, CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.Diagnostics.Extensions.GetAnalysisResultAsync(CompilationWithAnalyzersPair compilationWithAnalyzers, DocumentAnalysisScope documentAnalysisScope, Project project, DiagnosticAnalyzerInfoCache analyzerInfoCache, CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.Remote.Diagnostics.DiagnosticComputer.AnalyzeAsync(CompilationWithAnalyzersPair compilationWithAnalyzers, BidirectionalMap`2 projectAnalyzerToIdMap, BidirectionalMap`2 hostAnalyzerToIdMap, ImmutableArray`1 projectAnalyzers, ImmutableArray`1 hostAnalyzers, SkippedHostAnalyzersInfo skippedAnalyzersInfo, Boolean logPerformanceInfo, Boolean getTelemetryInfo, CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.Remote.Diagnostics.DiagnosticComputer.GetDiagnosticsAsync(ImmutableArray`1 projectAnalyzerIds, ImmutableArray`1 hostAnalyzerIds, Boolean logPerformanceInfo, Boolean getTelemetryInfo, CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.Remote.Diagnostics.DiagnosticComputer.GetNormalPriorityDiagnosticsAsync(ImmutableArray`1 projectAnalyzerIds, ImmutableArray`1 hostAnalyzerIds, Boolean logPerformanceInfo, Boolean getTelemetryInfo, CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.Remote.RemoteDiagnosticAnalyzerService.<>c__DisplayClass3_0.<b__0>d.MoveNext()
--- End of stack trace from previous location ---
at Microsoft.CodeAnalysis.Remote.RemoteWorkspace.<>c__DisplayClass7_0`1.<g__ProcessSolutionAsync|1>d.MoveNext()
--- End of stack trace from previous location ---
at Microsoft.CodeAnalysis.Remote.RemoteWorkspace.RunWithSolutionAsync[T](AssetProvider assetProvider, Checksum solutionChecksum, Boolean updatePrimaryBranch, Func`2 implementation, CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.Remote.RemoteWorkspace.RunWithSolutionAsync[T](AssetProvider assetProvider, Checksum solutionChecksum, Boolean updatePrimaryBranch, Func`2 implementation, CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.Remote.BrokeredServiceBase.RunWithSolutionAsync[T](Checksum solutionChecksum, Func`2 implementation, CancellationToken cancellationToken)
at Microsoft.CodeAnalysis.Remote.RemoteDiagnosticAnalyzerService.CalculateDiagnosticsAsync(Checksum solutionChecksum, DiagnosticArguments arguments, CancellationToken cancellationToken)
```