Nintex Automation K2 Updates & Fix Packs

IMPORTANT:If you perform a reconfigure without reinstalling the fix pack, users will not be able to log into Nintex Automation Designer/Manager/Workspace/Runtime after the reconfigure completes and the below error will occur:“HTTP Error 500.19 - Internal Server Error”NOTE:  If you have client tools installed, please do a manual IIS Reset after installing the Fix Pack. Fix Pack Release Date Download Link Fix Pack 01 30 June 2026 Download Fix Pack 01  Prerequisites and DependenciesThe Fix Packs are only compatible with Nintex Automation (5.9) products. Because Fix Packs are cumulative, each new Fix Pack contains the updates and fixes that were included with the previous Fix Pack releases. Nintex Automation (5.9.1) must be installed first after which the latest Fix Pack must be installed. To determine which cumulative update or fix pack has previously been installed in your environment see https://help.k2.com/kb000426. Note: Only upgrades from Nintex Automation

Issue DescriptionImplemented enhancements to improve validation and handling of server-side requests.ResolutionThe fix is available in:Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

Issue DescriptionWhen you modify the “To” recipient section in the email reminder configuration, the changes may sometimes be validated successfully, while other times they result in errors which prevent the Workflows from being redeployedError Message:The following error occurs:“The "Task" step's Reminders tab has one or more empty To fields”ResolutionThe fix is available in:Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

Issue DescriptionWhen you manually configure K2 for Azure Active Directory (AAD) for the first time it fails and an error occurs.Error Message:The following error occurs:“Error - arrayat SourceCode.Sync.SyncKey.GetStorage(Byte[] array, PropertyType type)at SourceCode.Sync.SyncKey.Create(String key)at SourceCode.Sync.Storage.Sql.Models.Identity.CreateScimId(Int64 instanceHashKey, String identifierNamePart, IdentityType identityType)at SourceCode.Sync.Storage.Sql.Repositories.ProviderRepository.EnsureIdentity(ProviderInstance instance, IIdentityInstruction instruction)at SourceCode.Sync.Storage.Sql.Repositories.ProviderRepository.d__5.MoveNext()”ResolutionThe fix is available in:Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is

Issue DescriptionWhen you attempt to install the Claims Service, installation will fail during the prerequisite validation even if the required .NET 10 runtime is correctly installed.Error Message:The following error occurs:“Dependency for 'Runtime' not met”ResolutionThe fix is available in:Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

Issue DescriptionWhen you upgrade, the Customer Relationship Management (CRM) SmartObject calls slow down as user traffic increases.ResolutionThe fix is available in:Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

Issue DescriptionWhen you use the Workflow Importer Tool, complex Workflows may not be fully converted, with only Set Variables steps being migrated and no associated data fields created, resulting in a mostly empty workflow skeleton with placeholders.ResolutionThe fix is available in:Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

Issue DescriptionWhen you use a supported non-English language, the initial Full Sync on a Provider completes successfully and all users are synced. However, if you attempt to run another Full Sync on the same Provider, it instead runs a Quick Sync. Switching the browser language back to English allows the Full Sync to run successfully again.ResolutionThe fix is available in:Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

Issue DescriptionWhen you navigate to the Sync Engine page, you may notice some of the text is displayed in English even when the language is set to Arabic, French, German or SpanishResolutionThe fix is available in:Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

Issue DescriptionWhen you run a Full Sync on an MSGraph Provider Type, from the browser, the sync completes successfully. However, if you then select the Sync button after the Full Sync has finished, A pop-up error window appears.Error Message:The following error occurs:“404 – File or directory not found.”ResolutionThe fix is available in:Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

DescriptionWhen you enable the SCIM API, you will receive a warning message if the SyncEngine is not enabled.Warning Message:The warning message will now occur:“Sync Engine is disabled. Are you sure you want to continue?”ResolutionThe fix is available in:Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

Issue DescriptionWhen you upgrade, you are unable to edit multiple Workflows in the Designer.Error Message:The following error occurs in the Browsers Developer Console:“ERROR TypeError: Cannot read properties of undefined (reading 'icon')”ResolutionThe fix is available in:Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

Issue DescriptionWhen you deploy a package containing SharePoint Online artifacts, the Package & Deployment tool may throw an error.Error Message:The following error occurs:“String was not recognized as a valid DateTime in Post Deployment”ResolutionThe fix is available in:Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

Issue DescriptionWhen you migrate to SPFX, you may not be able to start a Workflow by uploading a document to SharePoint Library.Error Message:The following error occurs:“An error has occurred: System.Exception: Exception has been thrown by the target of an invocation.”ResolutionThe fix is available in:Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

IMPORTANT:If you perform a reconfigure without reinstalling the fix pack, users will not be able to log into Nintex Automation Designer/Manager/Workspace/Runtime after the reconfigure completes and the below error will occur:“HTTP Error 500.19 - Internal Server Error”NOTE:  If you have client tools installed, please do a manual IIS Reset after installing the Fix Pack. Fix Pack Release Date Download Link Fix Pack 01 22 January 2026 Contact Support for this Fix Pack Fix Pack 02 10 February 2026 Contact Support for this Fix Pack Fix Pack 03 26 February 2026 Contact Support for this Fix Pack Fix Pack 04 6 March 2026 Contact Support for this Fix Pack Fix Pack 05 11 March 2026 Contact Support for this Fix Pack Fix Pack 06 2 April 2026 Contact Support for this Fix Pack Fix Pack 07 8 April 2026 Contact Support for this Fix Pack Fix Pack 08 24 April 2026 Contact Support for this Fix Pack Fix Pack 09 14 May 2026 Contact Support fo

Issue DescriptionWhen you register a REST Service Instance using a third-party Swagger file, the registration may fail. Although the Swagger definition passes validation and imports successfully into tools such as Postman and Swagger Editor, the exception can still occur in K2.Error Message:The following error occurs:“System.NullReferenceException object reference error”ResolutionThe fix is available in:Nintex Automation K2 (5.9) Fix Pack 12. Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

Issue DescriptionWhen you deploy a workflow containing a SmartObject step based on a Web Service Endpoint Service Instance, the deployment may fail if the SoapClientProtocol SerializedValue parameter is included. This issue occurs even when the parameter is left empty or populated with different test values, with the deployment resulting in an error.Error Message:The following error occurs:“The '(' character, hexadecimal value 0x28, cannot be included in a name”ResolutionThe fix is available in:Nintex Automation K2 (5.9) Fix Pack 12. Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.ConsiderationsIf you have an endpoint web service service instance where the "Add SoapHttpClientProtocolParameter to method" key is

Issue DescriptionWhen you upgrade, the picker control border is now broken when using the Grey Void Legacy theme.ResolutionThe fix is available in:Nintex Automation K2 (5.9) Fix Pack 12.  Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

IMPORTANT:If you perform a reconfigure without reinstalling the fix pack, users will not be able to log into Nintex Automation Designer/Manager/Workspace/Runtime after the reconfigure completes and the below error will occur:“HTTP Error 500.19 - Internal Server Error” NOTE:  If you have client tools installed, please do a manual IIS Reset after installing the Fix Pack. Fix Pack Release Date Download Link Fix Pack 01 23 October 2024 Contact Support for this Fix Pack Fix Pack 02 30 October 2024 Contact Support for this Fix Pack Fix Pack 03 8 November 2024 Contact Support for this Fix Pack Fix Pack 04 20 November 2024 Contact Support for this Fix Pack Fix Pack 05 12 December 2024 Contact Support for this Fix Pack Fix Pack 06 7 January 2025 Contact Support for this Fix Pack Fix Pack 07 16 January 2025 Contact Support for this Fix Pack Fix Pack 08 28 January 2025 Contact Support for this Fix Pack Fix Pack 09 19 February 2025

Issue DescriptionWhen you create a copy of a workflow in K2 Designer and deploy it from a K2 Workflow Category that contains spaces in its name, the category may be duplicated unexpectedly.ResolutionThe fix is available in:Nintex Automation K2 (5.8) Fix Pack 32.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

Issue DescriptionWhen you create a new item in SharePoint Online, the associated workflow is not triggered as expected.Error Message:The following error occurs: “Workflow name cannot be found”ResolutionThe fix is available in:Nintex Automation K2 (5.8) Fix Pack 32.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.ConsiderationsTo get the correct values written to Workflow settings you will have to redeploy the package after applying this fix pack.Note:Older incorrect entries may cause the process starter to fail if it attempts to use a workflow name that no longer exists. In this case, the outdated database entries must be removed manually by deleting the relevant row from Integration ProcessSharePointWorkflow,

Issue DescriptionWhen you run the Sync Service, it remains stuck in a running state and does not complete successfully.Error Message:The following message appears in the AdditionalInfo column:“0 IdentityCountNotSynced and 0 LinkCountNotSynced”ResolutionThe fix is available in:Nintex Automation K2 (5.9) Fix Pack 11. Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

Issue DescriptionWhen you use this path “https:///Designer/k2workflow/api/category/category/?systemId=1&category='” which includes the trailing ‘ ' ‘ character, an “UnsafeXML” error will occur.Error Message:The following error occurs: “Exception has been thrown by the target of an invocation.”ResolutionThe fix is available in:Nintex Automation K2 (5.8) Fix Pack 31. Nintex Automation K2 (5.9) Fix Pack 11. Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

Issue DescriptionWhen you install K2 or start the K2HostServer service, the service stops and an error occurs in server startup.Error Message:The following error occurs: “System.ArgumentNullException: Value cannot be null. Parameter name: productVersion”Followed later on by:“System.NullReferenceException: Object reference not set to an instance of an object.”ResolutionThe fix is available in:Nintex Automation K2 (5.8) Fix Pack 31. Nintex Automation K2 (5.9) Fix Pack 11. Nintex Automation K2 (5.9.1) Fix Pack 01.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.

Issue DescriptionWhen you run the SubscriptionRenewal workflow, workflow subscriptions are not renewed as expected.ResolutionThe fix is available in:Nintex Automation K2 (5.8) Fix Pack 31.Ensure you have the correct K2 version and/or Cumulative update installed. See KB001893 to see what Fix Pack level you have installed. Download the latest Fix Pack using the links in the table above for the version you require. Install the Fix Pack to apply the fix. It is recommended to clear browser cache and refresh the page.