When we rebuild the search index in our Umbraco instance we get this exception in the logs. Does anyone have any ideas why it fails creating the search indexes?

2019-08-20 17:06:24,963 [7] DEBUG - LogType=System, Login=admin, UserName=xyz, UserId=0, NodeId=-1, Path=, ContentName=, Message=Loading content from disk cache... 2019-08-20 17:06:25,106 [7] DEBUG - LogType=Error, Login=admin, UserName=xyz, UserId=0, NodeId=-1, Path=, ContentName=, Message=Error loading application startup handler: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.TypeInitializationException: The type initializer for 'Examine.ExamineManager' threw an exception. ---> umbraco.DataLayer.SqlHelperException: Umbraco Exception (DataLayer): SQL helper exception in ExecuteXmlReader ---> System.ArgumentException: The query didn't return a value. at umbraco.DataLayer.SqlHelper1.ExecuteXmlReader(String commandText, P[] parameters) at umbraco.DataLayer.SqlHelper1.ExecuteXmlReader(String commandText, IParameter[] parameters) --- End of inner exception stack trace --- at umbraco.DataLayer.SqlHelper1.ExecuteXmlReader(String commandText, IParameter[] parameters) at umbraco.cms.businesslogic.web.Document.importXml() at umbraco.cms.businesslogic.web.Document.ToXml(XmlDocument xd, Boolean Deep) at umbraco.cms.businesslogic.web.Document.ToXml(XmlDocument xd, Boolean Deep) at umbraco.cms.businesslogic.web.Document.ToXml(XmlDocument xd, Boolean Deep) at umbraco.cms.businesslogic.web.Document.ToXml(XmlDocument xd, Boolean Deep) at umbraco.cms.businesslogic.web.Document.XmlPopulate(XmlDocument xd, XmlNode& x, Boolean Deep) at UmbracoExamine.DataServices.UmbracoContentService.GetLatestContentByXPath(String xpath) at UmbracoExamine.BaseUmbracoIndexer.AddNodesToIndex(String xPath, String type) at UmbracoExamine.BaseUmbracoIndexer.PerformIndexAll(String type) at UmbracoExamine.BaseUmbracoIndexer.PerformIndexRebuild() at UmbracoExamine.UmbracoContentIndexer.RebuildIndex() at Examine.ExamineManager.LoadProviders() at Examine.ExamineManager..cctor() --- End of inner exception stack trace --- at umbraco.presentation.umbraco.Search.ExamineEvents..ctor() --- End of inner exception stack trace --- at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) at System.Activator.CreateInstance(Type type, Boolean nonPublic) at System.Activator.CreateInstance(Type type) at umbraco.businesslogic.ApplicationStartupHandler..cctor() 2019-08-20 17:06:25,114 [7] DEBUG - LogType=Error, Login=admin, UserName=xyz, UserId=0, NodeId=-1, Path=, ContentName=, Message=Error loading application startup handler: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.TypeInitializationException: The type initializer for 'Examine.ExamineManager' threw an exception. ---> umbraco.DataLayer.SqlHelperException: Umbraco Exception (DataLayer): SQL helper exception in ExecuteXmlReader ---> System.ArgumentException: The query didn't return a value. at umbraco.DataLayer.SqlHelper1.ExecuteXmlReader(String commandText, P[] parameters) at umbraco.DataLayer.SqlHelper1.ExecuteXmlReader(String commandText, IParameter[] parameters) --- End of inner exception stack trace --- at umbraco.DataLayer.SqlHelper1.ExecuteXmlReader(String commandText, IParameter[] parameters) at umbraco.cms.businesslogic.web.Document.importXml() at umbraco.cms.businesslogic.web.Document.ToXml(XmlDocument xd, Boolean Deep) at umbraco.cms.businesslogic.web.Document.ToXml(XmlDocument xd, Boolean Deep) at umbraco.cms.businesslogic.web.Document.ToXml(XmlDocument xd, Boolean Deep) at umbraco.cms.businesslogic.web.Document.ToXml(XmlDocument xd, Boolean Deep) at umbraco.cms.businesslogic.web.Document.XmlPopulate(XmlDocument xd, XmlNode& x, Boolean Deep) at UmbracoExamine.DataServices.UmbracoContentService.GetLatestContentByXPath(String xpath) at UmbracoExamine.BaseUmbracoIndexer.AddNodesToIndex(String xPath, String type) at UmbracoExamine.BaseUmbracoIndexer.PerformIndexAll(String type) at UmbracoExamine.BaseUmbracoIndexer.PerformIndexRebuild() at UmbracoExamine.UmbracoContentIndexer.RebuildIndex() at Examine.ExamineManager.LoadProviders() at Examine.ExamineManager..cctor() --- End of inner exception stack trace --- at UmbracoExamine.UmbracoEventManager..ctor() --- End of inner exception stack trace --- at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) at System.Activator.CreateInstance(Type type, Boolean nonPublic) at System.Activator.CreateInstance(Type type) at umbraco.businesslogic.ApplicationStartupHandler..cctor()