Hi,

• Umbraco Version: 7.3.4
• SQL : MSSQL 2014
• Server OS: Windows Server 2012 R2

Last night, at about 10:30pm (BST) our Umbraco site went down. When visiting the site we would be presented with a YSOD with the following exception:

Exception type: InvalidCastException 
    Exception message: Specified cast is not valid.
   at Umbraco.Core.Persistence.Database.PocoData.<GetConverter>b__3b(Object src)
   at petapoco_factory_48(IDataReader )
   at Umbraco.Core.Persistence.Database.<Query>d__7`1.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Umbraco.Core.Persistence.Repositories.LanguageRepository.PerformGetAll(Int32[] ids)
   at Umbraco.Core.Persistence.Repositories.RepositoryBase`2.GetAll(TId[] ids)
   at Umbraco.Core.Services.LocalizationService.GetAllLanguages()
   at Umbraco.Web.Routing.PublishedContentRequestEngine.FindDomain()
   at Umbraco.Web.Routing.PublishedContentRequestEngine.PrepareRequest()
   at Umbraco.Web.UmbracoModule.ProcessRequest(HttpContextBase httpContext)
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Although I have resolved the issue by rebooting the server I have no idea why it happened. Or if there was another way to resolve the issue. There were no content changes and the site had been stable prior to this.

Has anyone seen this error before? and if so, any ideas on what could have caused it?

Thanks,

Nik