Error on OTRS 6 after migration on FulltextIndexRebuildWorker

After the migration to OTRS 6 I see constantly the error of the Worker that
rebuilds the Index.

Indicates that you can not build the DateTime object but I do not know the
reason for it


The command I am using to manually execute the Worker is the following:

bin/otrs.Console.pl Maint::Ticket::FulltextIndexRebuildWorker --force-pid
--limit 700000

And error is:

ERROR: OTRS-otrs.Console.pl-Maint::Ticket::FulltextIndexRebuildWorker-01
Perl: 5.16.3 OS: linux Time: Tue Feb 27 15:10:41 2018

Message: Error creating DateTime object.

Traceback (9498):
   Module: Kernel::System::DateTime::new Line: 154
   Module: Kernel::System::ObjectManager::_ObjectBuild Line: 306
   Module: Kernel::System::ObjectManager::Create Line: 241
   Module: Kernel::System::Ticket::TicketGet Line: 1339
   Module: Kernel::System::Ticket::TicketArchiveFlagGet Line: 4040
   Module:
Kernel::System::Console::Command::Maint::Ticket::FulltextIndexRebuildWorker::ArticleIndexRebuild
Line: 168
   Module:
Kernel::System::Console::Command::Maint::Ticket::FulltextIndexRebuildWorker::Run
Line: 103
   Module: (eval) Line: 460
   Module: Kernel::System::Console::BaseCommand::Execute Line: 454
   Module: Kernel::System::Console::InterfaceConsole::Run Line: 80
   Module: bin/otrs.Console.pl Line: 38

Error: Can't call method "Delta" on an undefined value at
/opt/otrs/Kernel/System/Ticket.pm line 1346.


The error appears when I execute it manually as waiting for the
CronSchulder to execute it. As a major background run a FullTextIndex
rebuild and the process is stuck in 74.8%.

bin/otrs.Console.pl Maint::Ticket::FulltextIndex --rebuild

bin/otrs.Console.pl  Maint::Ticket::FulltextIndex --status
Indexed Articles: 74.8% (493212/659331)

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