We are trying to upgrade from 8.2.5.0004 to 8.2.6.0019.
We run the update. Then we try to update our oganizations, and a few seconds later, we get this error.
System.Xml.XmlException Hexadecimal value 0x00 is a invalid character, line 1974, position 20
Below is a small part of the crmdmsnapin.log file.
We are looking to find which XML file could be the problem.
Any help is much appreciated.

17:27:42| Info| Not setting state to Enabled as it is already set to Enabled
17:27:42| Info| Not setting state to Enabled as it is already set to Enabled
17:27:42| Error| La mise à jour de l’organisation (ID=c20ba27e-dedc-4abe-8bd6-d3a3016c1e29) a échoué avec l’exception :
System.Exception: Error.ActionFailed Microsoft.Crm.Tools.Admin.InstallDatabaseUpdatesAction ---> System.Xml.XmlException: '.', valeur hexadécimale 0x00, est un caractère non valide. Ligne 1974, position 20.
à System.Xml.XmlTextReaderImpl.Throw(Exception e)
à System.Xml.XmlTextReaderImpl.ParseText(Int32& startPos, Int32& endPos, Int32& outOrChars)
à System.Xml.XmlTextReaderImpl.ParseText()
à System.Xml.XmlTextReaderImpl.ParseElementContent()
à System.Xml.XmlLoader.LoadNode(Boolean skipOverWhitespace)
à System.Xml.XmlLoader.LoadDocSequence(XmlDocument parentDoc)
à System.Xml.XmlDocument.Load(XmlReader reader)
à Microsoft.Crm.SharedUtil.CreateXmlDocument(XmlReader reader)
à Microsoft.Crm.SharedUtil.CreateXmlDocument(String xml)
à Microsoft.Crm.Metadata.MetadataForMetadataXmlLoader.LoadMetadataForMetadata(String metadataForMetadataXml)
à Microsoft.Crm.Metadata.MetadataForMetadataXmlLoader.LoadMetadataForMetadataFromDirectory(String metadataForMetadataXmlDirectory)
à Microsoft.Crm.Setup.MetadataPatchDiffSet.LoadMetadataForMetadata(String filePathAndName)
à Microsoft.Crm.Setup.MetadataPatchDiffSet.InflateFromFile(String filePathAndName, Int32 lcid, Version version)
à Microsoft.Crm.Setup.MultiTenantMetadataDiffData..ctor(String metadataDiffFile, Version version)
à Microsoft.Crm.Setup.DBUpdateMultiTenantHelper.Init(String releaseFilePath, String actionFileDirectory, Version version)
à Microsoft.Crm.Setup.DBUpdateMultiTenantCache.GetInstance(Version version)
à Microsoft.Crm.Setup.Common.Update.DBUpdateDatabaseInstaller.ApplyDBUpdates(Guid orgId, Nullable`1 operationType)
à Microsoft.Crm.Tools.Admin.InstallDatabaseUpdatesAction.ApplyDBUpdatesInternal(Guid orgId, String orgUniqueName, String releaseFilePath, Boolean ignoreErrors, OrganizationOperationType operationType)
à Microsoft.Crm.Tools.Admin.InstallDatabaseUpdatesAction.ApplyDBUpdates(Guid orgId, String orgUniqueName, OrganizationOperationType operationType)
à Microsoft.Crm.Tools.Admin.InstallDatabaseUpdatesAction.Do(IDictionary parameters)
à Microsoft.Crm.Setup.Shared.CrmAction.ExecuteAction(CrmAction action, IDictionary parameters, Boolean undo)
--- Fin de la trace de la pile d'exception interne ---
à Microsoft.Crm.Setup.Shared.CrmAction.ExecuteAction(CrmAction action, IDictionary parameters, Boolean undo)
à Microsoft.Crm.Setup.Shared.Installer.Install(IDictionary stateSaver)
à Microsoft.Crm.Tools.Admin.OrganizationOperation.Install(IDictionary stateSaver)
à Microsoft.Crm.Tools.Admin.OrganizationOperation.Execute()
à Microsoft.Crm.Tools.Admin.OrganizationDatabaseHotFixer.Execute()
à Microsoft.Crm.Tools.Admin.ApplyDatabaseHotFixInstaller.ApplyDatabaseHotFix(IApplyDatabaseHotFixInfo applyDatabaseHotFixInfo)
17:27:42| Info| Found the older table DBUpdateInstallInfo_V5, updating new table and deleting
17:27:42| Info| GetDBUpdateRevisionThresholdForServer(): Threshold = 8.2.0006.0019.