Description

When enabling the enforce version presence feature, a request to the sitemap.xml page in the multi-language SXA site might fail with the following error:

[NullReferenceException: Object reference not set to an instance of an object.]
   Sitecore.XA.Feature.SiteMetadata.Sitemap.<GetItemsForOtherLanguages>d__29.MoveNext() +379
   System.Collections.Generic.List`1.InsertRange(Int32 index, IEnumerable`1 collection) +525
   Sitecore.XA.Feature.SiteMetadata.Sitemap.SitemapGenerator.ChildrenSearch(Item homeItem) +510
   Sitecore.XA.Feature.SiteMetadata.Sitemap.SitemapGenerator.GenerateSitemap(Item homeItem, NameValueCollection externalSitemaps, SitemapLinkOptions sitemapLinkOptions) +206
   Sitecore.XA.Feature.SiteMetadata.Pipelines.HttpRequestBegin.SitemapHandler.Process(HttpRequestArgs args) +707
   (Object , Object ) +13
   Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args) +483
   Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain, Boolean failIfNotExists) +235
   Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain) +21
   Sitecore.Web.RequestEventsHandler.OnPostAuthenticateRequest(HttpContextBase context) +213
   Sitecore.Nexus.Web.HttpModule.’(Object “, EventArgs ”) +334
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +222
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +212
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +90

Solution

To resolve the issue, consider one of the following options:

• Upgrade Sitecore XP instance to Sitecore XP 10.1.0 or later.
• For Sitecore XP 9.0.2 and SXA 1.8.0 and earlier, download and install the patch compatible with the affected product version found on this page:
  https://github.com/sitecoresupport/Sitecore.Support.321854/releases
• For Sitecore XP 9.1.1 and SXA 1.8.1, download and install the corresponding cumulative hotfix available in KB1001751.
• For Sitecore XP 9.3.0, download and install the corresponding cumulative hotfix available in KB1001754.