XFI vBulletin: Undefined array key "topicactiondelay" when importing RSS Feeds

[Kirby]

Code:

#0 src/addons/XFI/Import/Importer/vBulletin.php(2905): XF::handlePhpError(2, '[E_WARNING] Und...', '/var/www/vhosts...', 2905)
#1 src/XF/Import/Runner.php(244): XFI\Import\Importer\vBulletin->stepFeeds(Object(XF\Import\StepState), Array, 8)
#2 src/XF/Import/Runner.php(61): XF\Import\Runner->runStep('feeds', Object(XF\Import\StepState), 8)
#3 src/XF/Import/Runner.php(154): XF\Import\Runner->run()
#4 src/XF/Import/ParallelRunner.php(41)...

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