Checkboxes error

This issue still persists.

I am also getting same error.

Warning: Invalid argument supplied for foreach() in Drupal\Core\Render\Element\Checkboxes::valueCallback() (line 100 of core/lib/Drupal/Core/Render/Element/Checkboxes.php).
Drupal\Core\Render\Element\Checkboxes::valueCallback(Array, , Object)
call_user_func_array(Array, Array) (Line: 1273)
Drupal\Core\Form\FormBuilder->handleInputElement('sharethis_settings', Array, Object) (Line: 990)
Drupal\Core\Form\FormBuilder->doBuildForm('sharethis_settings', Array, Object) (Line: 1060)
Drupal\Core\Form\FormBuilder->doBuildForm('sharethis_settings', Array, Object) (Line: 1060)
Drupal\Core\Form\FormBuilder->doBuildForm('sharethis_settings', Array, Object) (Line: 1060)
Drupal\Core\Form\FormBuilder->doBuildForm('sharethis_settings', Array, Object) (Line: 561)
Drupal\Core\Form\FormBuilder->processForm('sharethis_settings', Array, Object) (Line: 318)
Drupal\Core\Form\FormBuilder->buildForm('sharethis_settings', Object) (Line: 93)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 582)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 151)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 67)
Drupal\simple_oauth\HttpMiddleware\BasicAuthSwap->handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 99)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 78)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 51)
Drupal\jsonapi\StackMiddleware\FormatSetter->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 665)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Thanks,
--Mani

This error is due to an empty value on $form['autotagger']['autotagger_source_field']['#options']. Setting this to an empty array if $default_source is not set should resolve this.

'#default_value' => ($default_source) ? $default_source : [],

Patch add ternary to set #default_value to empty array if $default source returns empty.

Yass!