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In administrator/components/com_chronoforms5/chronoforms/actions/email/email.php the line 246
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 if($settings['mail']['mail_method'] == 'joomla'){

delivers this php notice:
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Notice: Undefined index: mail in [domain]\administrator\components\com_chronoforms5\chronoforms\actions\email\email.php on line 246
​
How can I fix this?

Hi HerKle,
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The simplest way is to set your Site Error Reporting to System Default. PHP Notices are usually a nuisance, not a problem.
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If you need to keep it at a high level then you could edit the code to check if 'mail' is set in the $settings array.
​
Bob