Error in Nation

From a clean install of Nation when I try to add something to shopping cart I get the following errors.

Notice: Undefined index: base in Drupal\views\Plugin\views\query\QueryPluginBase->getEntityTableInfo() (line 292 of core/modules/views/src/Plugin/views/query/QueryPluginBase.php).
Notice: Undefined index: base in Drupal\views\Plugin\views\query\QueryPluginBase->getEntityTableInfo() (line 292 of core/modules/views/src/Plugin/views/query/QueryPluginBase.php).
Notice: Undefined index: base in Drupal\views\Plugin\views\query\QueryPluginBase->getEntityTableInfo() (line 292 of core/modules/views/src/Plugin/views/query/QueryPluginBase.php).
Notice: Undefined index: base in Drupal\views\Plugin\views\query\QueryPluginBase->getEntityTableInfo() (line 292 of core/modules/views/src/Plugin/views/query/QueryPluginBase.php).
Notice: Undefined index: base in Drupal\views\Plugin\views\query\QueryPluginBase->getEntityTableInfo() (line 292 of core/modules/views/src/Plugin/views/query/QueryPluginBase.php).
Notice: Undefined index: base in Drupal\views\Plugin\views\query\QueryPluginBase->getEntityTableInfo() (line 292 of core/modules/views/src/Plugin/views/query/QueryPluginBase.php).

Does anyone know why this may happen?