Adding block results in a checkbox array error

Problem/Motivation

Context user profile causes an error when the block configuration screen is loaded. The block is not rendered.

Warning: Invalid argument supplied for foreach() in Drupal\Core\Render\Element\Checkboxes::valueCallback() (line 100 of
/Sites/gold50/web/core/lib/Drupal/Core/Render/Element/Checkboxes.php) #0 /Sites/gold50/web/core/includes/bootstrap.inc(600):
_drupal_error_handler_real(2, 'Invalid argumen...', '/...', 100, Array)
#1 /Sites/gold50/web/core/lib/Drupal/Core/Render/Element/Checkboxes.php(100): _drupal_error_handler(2, 'Invalid argumen...', '/...', 100,
Array)
#2 [internal function]: Drupal\Core\Render\Element\Checkboxes::valueCallback(Array, false, Object(Drupal\Core\Form\FormState))
#3 /Sites/gold50/web/core/lib/Drupal/Core/Form/FormBuilder.php(1278): call_user_func_array(Array, Array)
#4 /Sites/gold50/web/core/lib/Drupal/Core/Form/FormBuilder.php(1001): Drupal\Core\Form\FormBuilder->handleInputElement('block_form', Array,
Object(Drupal\Core\Form\FormState))
#5 /Sites/gold50/web/core/lib/Drupal/Core/Form/FormBuilder.php(1071): Drupal\Core\Form\FormBuilder->doBuildForm('block_form', Array,
Object(Drupal\Core\Form\FormState))
#6 /Sites/gold50/web/core/lib/Drupal/Core/Form/FormBuilder.php(1071): Drupal\Core\Form\FormBuilder->doBuildForm('block_form', Array,
Object(Drupal\Core\Form\FormState))
#7 /Sites/gold50/web/core/lib/Drupal/Core/Form/FormBuilder.php(1071): Drupal\Core\Form\FormBuilder->doBuildForm('block_form', Array,
Object(Drupal\Core\Form\FormState))
#8 /Sites/gold50/web/core/lib/Drupal/Core/Form/FormBuilder.php(575): Drupal\Core\Form\FormBuilder->doBuildForm('block_form', Array,
Object(Drupal\Core\Form\FormState))
#9 /Sites/gold50/web/core/lib/Drupal/Core/Form/FormBuilder.php(321): Drupal\Core\Form\FormBuilder->processForm('block_form', Array,
Object(Drupal\Core\Form\FormState))
#10 /Sites/gold50/web/core/lib/Drupal/Core/Entity/EntityFormBuilder.php(61): Drupal\Core\Form\FormBuilder->buildForm(Object(Drupal\block\BlockForm),
Object(Drupal\Core\Form\FormState))
#11 /Sites/gold50/web/core/modules/block/src/Controller/BlockAddController.php(27):
Drupal\Core\Entity\EntityFormBuilder->getForm(Object(Drupal\block\Entity\Block))
#12 [internal function]: Drupal\block\Controller\BlockAddController->blockAddConfigureForm('g50_gold_price_...', 'gold50')
#13 /Sites/gold50/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array)
#14 /Sites/gold50/web/core/lib/Drupal/Core/Render/Renderer.php(573):
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#15 /Sites/gold50/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124):
Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure))
#16 /Sites/gold50/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97):
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array)
#17 /Sites/gold50/vendor/symfony/http-kernel/HttpKernel.php(151):
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#18 /Sites/gold50/vendor/symfony/http-kernel/HttpKernel.php(68):
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1)
#19 /Sites/gold50/web/core/lib/Drupal/Core/StackMiddleware/Session.php(57):
Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#20 /Sites/gold50/web/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47):
Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#21 /Sites/gold50/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(106):
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#22 /Sites/gold50/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(85):
Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#23 /Sites/gold50/web/modules/contrib/cleantalk/src/EventSubscriber/BootSubscriber.php(287):
Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#24 /Sites/gold50/web/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47):
Drupal\cleantalk\EventSubscriber\BootSubscriber->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#25 /Sites/gold50/web/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(52):
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#26 /Sites/gold50/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23):
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#27 /Sites/gold50/web/core/lib/Drupal/Core/DrupalKernel.php(708): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1,
true)
#28 /Sites/gold50/web/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request))
#29 {main}.

Steps to reproduce

1. install context 4.0.0
2. Attempt to enable a block

An error is reported. The block is not displayed (probably related to https://www.drupal.org/project/context/issues/3225763)

Proposed resolution

Apply a default to the form for user profile

Remaining tasks

User interface changes

API changes

Data model changes