checkRequirements does not validate $warning/$error are arrays

[Xon]

AbstractSetup::checkRequirements has the signature public function checkRequirements(&$errors = [], &$warnings = [])

However, nothing actually checks that $errors and $warnings remain arrays which can result in the not very useful error message;

Code:

Code:

In AddOnActionTrait.php line 73:

  [ErrorException]
  [E_WARNING] foreach() argument must be of type array|object, string given

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