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Unable to Edit Workflow in Workflow Designer After Importing Subscription License


After importing a Subscription license (.nlfx) from an Expiring license (.nlf), some workflows are unable to be open in the Nintex Workflow Designer.


Error Code

System.NullReferenceException: Object reference not set to an instance of an object.
at Nintex.Workflow.ApplicationPages.Preview.IsWorkflowProduction()
at Nintex.Workflow.ApplicationPages.Preview.Page_Load(Object sender, EventArgs e)
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Web.UI.Control.OnLoad(EventArgs e)
at Microsoft.SharePoint.WebControls.UnsecuredLayoutsPageBase.OnLoad(EventArgs e)
at Microsoft.SharePoint.WebControls.LayoutsPageBase.OnLoad(EventArgs e)
at Nintex.Workflow.ServerControls.NintexLayoutsBase.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)



Update to the March 2020 release or later for each respective version of SharePoint. The March 2020 versions are as follows:


Nintex Workflow for SharePoint 2013 -

Nintex for SharePoint 2016 -

Nintex for SharePoint 2019 -


Additional Information

This issue is not explicitly mentioned in the release notes, however, the March 2020 release is the only release that has any mention of addressing an issue when moving from perpetual to subscription licensing:


"Fixed issue where workflow and actions not calculated when importing subscription license from perpetual license (163904)"


It is also possible that the null reference is in regard to a user that no longer exists. If the only workflows impacted by this issue were last published by a non-existent account, and there are not many workflows to fix, it may be worth simply exporting, importing, and publishing the workflows again.

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Version history
Last update:
‎02-15-2022 07:54 AM
Updated by: