We just upgraded to Kentico 8.0.18. Our content editor is unable to save new documents or save updates to existing documents. The event log entries says:
EventID: 266199
EventType: E
EventTime: 8/14/2014 5:38:59 PM
Source: Content
EventCode: SAVEDOCUMENT
UserID: 42
UserName: foobar
EventDescription: An error occurred when saving data. Please see event log for more details.
Message: Object reference not set to an instance of an object.
Exception type: System.NullReferenceException
Stack Trace:
at CMS.Controls.CMSEditableRegion.IsValid()
at CMS.PortalControls.CMSPortalManager.Validate()
at CMS.PortalControls.CMSPortalManager.DocumentManager_OnValidateData(Object sender, DocumentManagerEventArgs e)
at CMS.FormControls.CMSAbstractManager`2.RaiseValidateData(EventArgsType args)
at CMS.FormControls.CMSDocumentManager.SaveDocumentInternal(String actionContext)
Site: New Victory Theater
EventUrl: /cms/getdoc/80555f2a-39c9-4293-9f71-2781c3e1af45/TestPage.aspx?viewmode=3&showpanel=1&lang=en-US&langobjectlifetime=request&cmscontentchanged=false
EventMachineName: AWS-S16
EventUserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.143 Safari/537.36
EventUrlReferrer: http://beta.newvictory.org/cms/getdoc/80555f2a-39c9-4293-9f71-2781c3e1af45/TestPage.aspx?viewmode=3&showpanel=1&lang=en-US&langobjectlifetime=request&cmscontentchanged=false