TypeError: Argument 1 passed to XF\Import\Data\ThreadPrefix::setTitle() must be of the type string, null given

[Kirby]

Affected version

1.4.1

#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}

 

[Kirby]

Still happens in 1.5.0

 

[Kirby]

Still happens in 1.5.1 (with another database to import)