I have faced an issue with fast queries in Sitecore 10.1.

When I execute SelectSingleItem fast query:


I get the following error:

Exception: System.NullReferenceException
Message: Object reference not set to an instance of an object.
Source: Sitecore.Kernel
   at Sitecore.Data.DataProviders.CompositeDataProvider.TransformQuery(String query, Boolean& allowMerging, String& filterPathId)
   at Sitecore.Data.DataProviders.CompositeDataProvider.SelectIDsInternalFast(String query, Boolean singleItemQuery, CallContext context)
   at Sitecore.Data.DataProviders.CompositeDataProvider.SelectSingleID(String query, CallContext context)
   at Sitecore.Data.DataProviders.DataProvider.SelectSingleID(String query, CallContext context, DataProviderCollection providers)
   at Sitecore.Data.DataManager.SelectSingleItem(String query, Boolean& processed)
   at Sitecore.Data.DefaultDatabase.SelectSingleItem(String query)

It works fine if I remove "fast:" prefix in query. Fast queries also work fine in previous Sitecore versions (tested in all 9.0-10.0).

The problem is that it is a bad idea to change all queries in project. Is there any solution without project refactoring?


1 Answer 1


Fast:// Query is not supported in Sitecore 10.1 and onwards.

Sources: http://www.stockpick.nl/english/the-end-of-sitecore-fast-query/

Official Source: https://dev.sitecore.net/Downloads/Sitecore%20Experience%20Platform/101/Sitecore%20Experience%20Platform%20101/Release%20Notes#Highlights

Sitecore Experience Platform 10.1.0 includes:

  • ​You can now use the content hierarchy to assign a behavior profile to multiple items. ​​- You can now use content tags to assign a behavior profile to multiple items.​
  • The Collection database now supports scalable reads.
  • You can now use the new ​Data Purge CLI tool to remove unwanted contact data from the Experience Database​.
  • Sitecore Fast Query has been deprecated.

[...] and more

  • 1
    Thank you! I didn`t know that.
    – x3mxray
    Commented Jun 14, 2022 at 13:49

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