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Fix NullReferenceException#9225
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`FirstOrDefault` can return null, so it's not safe to dereference unconditionally.Observed while debugging VS:```System.NullReferenceException: Object reference not set to an instance of an object.Microsoft.TemplateEngine.Orchestrator.RunnableProjects.LocalizationModelDeserializer.LoadPostActionModels.AnonymousMethod__4_4((System.Collections.Generic.IEnumerable<string> NameParts, string LocalizedString) s)System.Linq.Enumerable.WhereSelectEnumerableIterator<(System.Collections.Generic.IEnumerable<string>, string), (System.Collections.Generic.IEnumerable<string>, string)>.MoveNext()System.Linq.Lookup<string, (System.Collections.Generic.IEnumerable<string>, string)>.Create<(System.Collections.Generic.IEnumerable<string>, string)>(System.Collections.Generic.IEnumerable<(System.Collections.Generic.IEnumerable<string>, string)> source, System.Func<(System.Collections.Generic.IEnumerable<string>, string), string> keySelector, System.Func<(System.Collections.Generic.IEnumerable<string>, string), (System.Collections.Generic.IEnumerable<string>, string)> elementSelector, System.Collections.Generic.IEqualityComparer<string> comparer)System.Linq.GroupedEnumerable<(System.Collections.Generic.IEnumerable<string>, string), string, (System.Collections.Generic.IEnumerable<string>, string)>.GetEnumerator()Microsoft.TemplateEngine.Orchestrator.RunnableProjects.LocalizationModelDeserializer.LoadManualInstructionModels(System.Collections.Generic.IEnumerable<(System.Collections.Generic.IEnumerable<string> NameParts, string LocalizedString)> strings)Microsoft.TemplateEngine.Orchestrator.RunnableProjects.LocalizationModelDeserializer.LoadPostActionModels(System.Collections.Generic.List<(string Key, string Value)> localizedStrings)Microsoft.TemplateEngine.Orchestrator.RunnableProjects.LocalizationModelDeserializer.Deserialize(Microsoft.TemplateEngine.Abstractions.Mount.IFile file)Microsoft.TemplateEngine.Orchestrator.RunnableProjects.ScannedTemplateInfo.FindLocalizations()Microsoft.TemplateEngine.Orchestrator.RunnableProjects.ScannedTemplateInfo.ScannedTemplateInfo(Microsoft.TemplateEngine.Abstractions.IEngineEnvironmentSettings settings, Microsoft.TemplateEngine.Abstractions.IGenerator generator, Microsoft.TemplateEngine.Abstractions.Mount.IFile templateFile)Microsoft.TemplateEngine.Orchestrator.RunnableProjects.RunnableProjectGenerator.GetTemplatesFromMountPointInternalAsync(Microsoft.TemplateEngine.Abstractions.Mount.IMountPoint source, System.Threading.CancellationToken cancellationToken) Microsoft.TemplateEngine.Orchestrator.RunnableProjects.RunnableProjectGenerator.Microsoft.TemplateEngine.Abstractions.IGenerator.GetTemplatesFromMountPointAsync(Microsoft.TemplateEngine.Abstractions.Mount.IMountPoint source, System.Threading.CancellationToken cancellationToken)Microsoft.TemplateEngine.Edge.Settings.Scanner.ScanMountPointForTemplatesAsync(Microsoft.TemplateEngine.Edge.Settings.Scanner.MountPointScanSource source, bool logValidationResults, bool returnInvalidTemplates, System.Threading.CancellationToken cancellationToken)Microsoft.TemplateEngine.Edge.Settings.Scanner.ScanAsync(string mountPointUri, System.Threading.CancellationToken cancellationToken)Microsoft.TemplateEngine.Edge.Settings.TemplatePackageManager.UpdateTemplateCacheAsync.AnonymousMethod__2(int index)```
joeloff approved these changesAug 5, 2025
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Is this something we should consider backporting for 8 and 9?
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drewnoakes commentedAug 5, 2025
@joeloff I'm not sure. Seems low risk, but I don't know the impact. I'm not familiar with the merge policy for this repo. Please merge when makes sense. |
MiYanni approved these changesAug 5, 2025
5c71193 intomain 9 checks passed
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FirstOrDefaultcan return null, so it's not safe to dereference unconditionally.Observed while debugging VS: