Hi,

I encountered an error when distributed calls are enabled, the logs show this error:

System.InvalidOperationException: Cannot refresh by id if the idArrayType is null
   at Umbraco.Core.Sync.DefaultServerMessenger.PerformDistributedCall(IEnumerable`1 servers, ICacheRefresher refresher, MessageType dispatchType, IEnumerable`1 ids, Type idArrayType, String jsonPayload) in c:\GITProjects\Umbraco-CMS-7.1.4\Umbraco-CMS-7.1.4\src\Umbraco.Core\Sync\DefaultServerMessenger.cs:line 431

It occurs when I Save And Publish a new node. Umbraco publishes the new node, and also tries to publish all other related unpublished nodes... if there are none, it passes an empty array, this causes the idArrayType not being set (since there is nothing to save) and throwing the error...

The cause, though, seems to be higher up the call stack in the CacheRefreshEventHandler...
There I find this piece of code:

            //filter out the entities that have only been saved (not newly published) since
            // newly published ones will be synced with the published page cache refresher
            var unpublished = e.SavedEntities.Where(x => x.JustPublished() == false);
            //run the un-published cache refresher
            DistributedCache.Instance.RefreshUnpublishedPageCache(unpublished.ToArray());

The unpublished list is empty and should not be passed on anyways, but because it is passed, the idArrayType cannot be set, and the error is thrown...

An if(unpublished.Any()) would solve this...

The bug does not seem to be a huge problem, but it causes the logs of a new site (being filled with new content) to have a lot of errors in the logs...

Hope someone can look into this, or tell me what I'm doing wrong :-)

Best Regards,

Sandro Mastronardi