Site Contents > Site Workflows = Something went wrong and a correlation id for one user.

Other users, no problem (_layouts/15/workflow.aspx) until they select "View all workflows" (/_layouts/15/workflow.aspx?ShowAll=1) and then they get the same problem. As if something in the workflow history of the first user that causes the error (second user doesn't see it unless they "view all workflows".

Digging around in the log looking for the correlation id and I'm seeing messages like:

"12/15/2021 14:57:06.90 w3wp.exe (0x2915C) 0x26818 SharePoint Foundation General ai1wu Medium System.Runtime.InteropServices.COMException: List does not exist. The page you selected contains a list that does not exist. It may have been deleted by another user."

"12/15/2021 14:57:06.90 w3wp.exe (0x2915C) 0x26818 SharePoint Foundation Runtime tkau Unexpected System.NullReferenceException: Object reference not set to an instance of an object. at Microsoft.SharePoint.Workflow.SPWorkflow.GetIStatusAsText(Int32 iStatus) at Microsoft.SharePoint.Workflow.SPWorkflow.GetIStatusAsHtml(Int32 iStatus) at Microsoft.SharePoint.Workflow.SPWorkflow.GetIStatusAsHtml() at ASP._layouts_15_workflow_aspx.__Render__control18(HtmlTextWriter __w"

"12/15/2021 14:57:06.90 w3wp.exe (0x2915C) 0x26818 SharePoint Foundation WOPI aubgn Monitorable SPOIncidentsDetectionJob.UpdateErrorTextsIfNeeded: System.InvalidOperationException: Nullable object must have a value. at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) at Microsoft.SharePoint.Administration.SPOIncidentsDetectionJob.GetSPOIncidentBitStatus() at Microsoft.SharePoint.Administration.SPOIncidentsDetectionJob.UpdateErrorTextsIfNeeded(String& errorText"

First user was creating and modifying a lot of workflows. Any thoughts?

Thanks in advance