Hi All,

Am getting a null reference exception trying to insert an image into a rich text editor via the Tiny MCE insert image button. 

[NullReferenceException: Object reference not set to an instance of an object.]
   umbraco.presentation.plugins.tinymce3.insertImage.Page_Load(Object sender, EventArgs e) +185
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +24
   System.EventHandler.Invoke(Object sender, EventArgs e) +0
   umbraco.BasePages.BasePage.OnLoad(EventArgs e) +18
   System.Web.UI.Control.LoadRecursive() +70
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3047

The overlay loads after hitting the button and then the exception appears in the overlay. Is a fairly standard install of 4.7.1. Log table shows same stack trace.

Not sure where to look to start debugging? any pointers would be much appreciated. anyone seen this before?

Many Thanks,

Tom