I have a clustered umbraco setup and am using distributed call to keep the cache in sync between the nodes.

We have a problem where if we delete a node we get an error while trying to refresh the cache (I think it is on the nodes being updated rather than master but the log doesn't say explicitly).

Here is the error I get:

  Error refreshing a node in the distributed list: 'System.Web.Services.Protocols.SoapException: System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.ArgumentNullException: Value cannot be null.

Parameter name: attribute

   at System.Xml.Linq.XAttribute.op_Explicit(XAttribute attribute)

   at UmbracoExamine.UmbracoContentIndexer.ReIndexNode(XElement node, String type)

   at Examine.ExamineManager._ReIndexNode(XElement node, String type, IEnumerable`1 providers)

   at umbraco.content.DocumentCacheEventHandler.Invoke(Document sender, DocumentCacheEventArgs e)

   at umbraco.content.FireAfterUpdateDocumentCache(Document sender, DocumentCacheEventArgs e) in d:\Dropbox\Dev\UmbracoSource_v4\src\Umbraco.Web\umbraco.presentation\content.cs:line 747

   at umbraco.content.UpdateDocumentCache(Document d) in d:\Dropbox\Dev\UmbracoSource_v4\src\Umbraco.Web\umbraco.presentation\content.cs:line 524

   at umbraco.content.UpdateDocumentCache(Int32 pageId) in d:\Dropbox\Dev\UmbracoSource_v4\src\Umbraco.Web\umbraco.presentation\content.cs:line 467

   at umbraco.presentation.cache.pageRefresher.Refresh(Int32 Id) in d:\Dropbox\Dev\UmbracoSource_v4\src\Umbraco.Web\umbraco.presentation\umbraco\cache\pageRefresher.cs:line 72

   at umbraco.presentation.webservices.CacheRefresher.RefreshById(Guid uniqueIdentifier, Int32 Id, String Login, String Password) in d:\Dropbox\Dev\UmbracoSource_v4\src\Umbraco.Web\umbraco.presentation\umbraco\webservices\CacheRefresher.asmx.cs:line 79

   --- End of inner exception stack trace ---

   at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)

   at System.Web.Services.Protocols.SoapHttpClientProtocol.EndInvoke(IAsyncResult asyncResult)

   at umbraco.presentation.cache.CacheRefresher.EndRefreshById(IAsyncResult asyncResult) in d:\Dropbox\Dev\UmbracoSource_v4\src\Umbraco.Web\umbraco.presentation\umbraco\cache\CacheRefresher.cs:line 106

   at umbraco.presentation.cache.dispatcher.InvokeDispatchMethod(DispatchType dispatchType, Guid factoryGuid, Int32 numericId, Guid guidId) in d:\Dropbox\Dev\UmbracoSource_v4\src\Umbraco.Web\umbraco.presentation\umbraco\cache\dispatcher.cs:line 149'

Is there a known solution to this problem?

I am on umbraco v 4.9.0 (Assembly version: 1.0.4868.25391)

Thanks