2.2.5 to 2.3 upgrade - Undefined array key "emailDkim"

[JackieChun]

Stuck while upgrading. Forum not functional anymore. Someone else posted the same error in a different thread without a resolution.

ErrorException: [E_WARNING] Undefined array key "emailDkim" in src/XF/Install/Upgrade/2030037-230b7.php at line 46
XF::handlePhpError() in src/XF/Install/Upgrade/2030037-230b7.php at line 46
XF\Install\Upgrade\Version2030037->step4() in src/XF/Install/Controller/Upgrade.php at line 192
XF\Install\Controller\Upgrade->actionRun() in src/XF/Mvc/Dispatcher.php at...
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2.2.5 to 2.3 upgrade - Undefined array key "emailDkim"

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