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Passing a typed array through array_filter loses its type knowledge · Issue #1500 · bmewburn/vscode-intelephense · GitHub
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![array_filter() expects parameter 1 to be array, null given in Drupal\webform_mailchimp\Plugin\WebformHandler\WebformMailChimpHandler->postSave() [#3096797] | Drupal.org](https://www.drupal.org/files/issues/2019-11-26/Screenshot%202019-11-26%20at%2010.58.38.png "array_filter() expects parameter 1 to be array, null given in Drupal\webform_mailchimp\Plugin\WebformHandler\WebformMailChimpHandler->postSave() [#3096797] | Drupal.org")