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[code]

#0 src/addons/XFI/Import/Importer/vBulletin.php(2773): XF\Import\Data\ThreadPrefix->setTitle(NULL)

#1 src/XF/Import/Runner.php(242): XFI\Import\Importer\vBulletin->stepThreadPrefixes(Object(XF\Import\StepState), Array, 8)

#2 src/XF/Import/Runner.php(59): XF\Import\Runner->runStep('threadPrefixes', Object(XF\Import\StepState), 8)

#3 src/XF/Import/Runner.php(152): XF\Import\Runner->run()

#4 src/XF/Import/ParallelRunner.php(40): XF\Import\Runner->runUntilCompleteInternal(Object(XF\Import\Manager), Object(Closure))

#5 src/XF/Import/Runner.php(128): XF\Import\ParallelRunner->runUntilCompleteInternal(Object(XF\Import\Manager), Object(Closure))

#6 src/XF/Cli/Command/Import.php(155): XF\Import\Runner->runUntilComplete(Object(XF\Import\Manager), Object(Closure))

#7 src/vendor/symfony/console/Command/Command.php(255): XF\Cli\Command\Import->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

#8 src/vendor/symfony/console/Application.php(992): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

#9 src/vendor/symfony/console/Application.php(255): Symfony\Component\Console\Application->doRunCommand(Object(XF\Cli\Command\Import), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

#10 src/vendor/symfony/console/Application.php(148): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

#11 src/XF/Cli/Runner.php(109): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

#12 cmd.php(15): XF\Cli\Runner->run()

#13 {main}

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