Description

The Publishing Dashboard might fail to display active, queued, and recent publishing jobs. The following errors can be found in the logs:

Exception System.InvalidOperationException: Nullable object must have a value.
at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
at Sitecore.Publishing.Service.RemoteProxies.ManifestStepMessageExtensions.ToManifestStatus(ManifestStatusMessage message)
at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
...

Solution

To resolve the issue, download and install the hotfix compatible with the affected product version:

• For Sitecore Publishing Service Module 9.1.0: SC Hotfix 381472-1.zip
• For Sitecore Publishing Service Module 9.1.1: SC Hotfix 415316-1.zip
• For Sitecore Publishing Service Module 9.2.0: SC Hotfix 435171-1.zip
• For Sitecore Publishing Service Module 9.3.0: SC Hotfix 420780-1.zip

Be aware that the hotfixes were built for the specific Sitecore Publishing Service Module versions and must not be installed on other Sitecore Publishing Service Module versions or in combination with other hotfixes. In case any other hotfixes have already been installed on a certain Sitecore XP instance, send a request for a compatibility check to Sitecore Support.

Note that the ZIP file contents must be extracted to locate installation instructions and related files inside. The hotfix must be installed on a CM instance and then synced with other instances using standard development practices.