DNN 4.9 ... Intermittent error while uploading PDF files

Question

I get intermittent "Object reference is not set to an instance of an object" errors when uploading PDF files in FCKEditor in DNN 4.9.

Here's the error:

AssemblyVersion: 04.09.00
AbsoluteURL: /.../Providers/HtmlEditorProviders/Fck/fcklinkgallery.aspx
UserAgent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; IEMB3; IEMB3)
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.UI.UserControls.UrlControl.cmdSave_Click
StackTrace: Message: DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.UI.UserControls.UrlControl.cmdSave_Click(Object sender, EventArgs e) at System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e) at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---

The error comes and goes, file size doesn't seem to matter, last time i got it after uploading a couple of 1MB files, the third file (600kB) gave me an error.

Please help!

Answer 1

I have noticed this on a number of sites with the FCK provider that is included in 4.9.0 and later versions of DotNetNuke.

At this time I am not aware of any way to "Fix" it, as I have not pinpointed exactly what is causing the error.