Here is how I got this error:
1- edit user's image field property: admin/config/people/accounts/fields/user.user.user_picture
2-in the "File (Field) Path settings" check "Retroactive update"
3-save the form
4-I got the following error:
Drupal\Core\Entity\Query\QueryException: '' not found in Drupal\Core\Entity\Query\Sql\Tables->ensureEntityTable() (line 316 of core/lib/Drupal/Core/Entity/Query/Sql/Tables.php).
Drupal\Core\Entity\Query\Sql\Tables->addField('', 'INNER', NULL) (Line: 44)
Drupal\Core\Entity\Query\Sql\Condition->compile(Object) (Line: 155)
Drupal\Core\Entity\Query\Sql\Query->compile() (Line: 74)
Drupal\Core\Entity\Query\Sql\Query->execute() (Line: 263)
filefield_paths_batch_update(Object) (Line: 238)
filefield_paths_form_submit(Array, Object)
call_user_func_array('filefield_paths_form_submit', Array) (Line: 111)
Drupal\Core\Form\FormSubmitter->executeSubmitHandlers(Array, Object) (Line: 51)
Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object) (Line: 585)
Drupal\Core\Form\FormBuilder->processForm('field_config_edit_form', Array, Object) (Line: 314)
Drupal\Core\Form\FormBuilder->buildForm('field_config_edit_form', Object) (Line: 74)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 574)
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}()
call_user_func_array(Object, Array) (Line: 153)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel->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: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 50)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 656)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)