diff --git a/modules/facets_exposed_filters/facets_exposed_filters.module b/modules/facets_exposed_filters/facets_exposed_filters.module
index 2c02efb..5f0d700 100644
--- a/modules/facets_exposed_filters/facets_exposed_filters.module
+++ b/modules/facets_exposed_filters/facets_exposed_filters.module
@@ -44,3 +44,35 @@ function facets_exposed_filters_form_facets_facet_edit_form_alter(&$form, FormSt
   }
 }
 
+function facets_exposed_filter_remove_validation($element, $form) {
+  // Because facet options get limited while filtering, we need to allow values
+  // which are not in the options list.
+  unset($element["#needs_validation"]);
+  return $element;
+}
+
+function facets_exposed_filters_form_views_exposed_form_alter(&$form, FormStateInterface $form_state) {
+  // Ensure this code only triggers on views with exposed facet filters.
+  if ($form_state->get('uses_facets_exposed_filters')) {
+    // Add non-existing facet values as hidden fields, so they are not lost when
+    // a new filter is selected.
+    $user_input = $form_state->getUserInput();
+    foreach ($user_input as $form_element_id => $values) {
+      if (!is_array($values)) {
+        continue;
+      }
+      if (isset($form[$form_element_id]["#options"])) {
+        foreach ($values as $value) {
+          // Check if any of the values is not in the option list (anymore).
+          if (!isset($form[$form_element_id]["#options"][$value])) {
+            $form['facets_hidden_' . $form_element_id] = [
+              '#type' => 'hidden',
+              '#value' => $value,
+              '#attributes' => ['name' => $form_element_id . '[' . $value . ']'],
+            ];
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/modules/facets_exposed_filters/src/Plugin/views/FacetsViewsPluginTrait.php b/modules/facets_exposed_filters/src/Plugin/views/FacetsViewsPluginTrait.php
index 0241793..7d2dff9 100644
--- a/modules/facets_exposed_filters/src/Plugin/views/FacetsViewsPluginTrait.php
+++ b/modules/facets_exposed_filters/src/Plugin/views/FacetsViewsPluginTrait.php
@@ -69,6 +69,7 @@ trait FacetsViewsPluginTrait {
         '#type' => 'select',
         '#options' => $facet_build[0],
         '#multiple' => $this->options["expose"]["multiple"],
+        '#process' => ['facets_exposed_filter_remove_validation']
       ];
     }
 
diff --git a/modules/facets_exposed_filters/src/Plugin/views/filter/FacetsFilter.php b/modules/facets_exposed_filters/src/Plugin/views/filter/FacetsFilter.php
index 4be699a..1a048d9 100644
--- a/modules/facets_exposed_filters/src/Plugin/views/filter/FacetsFilter.php
+++ b/modules/facets_exposed_filters/src/Plugin/views/filter/FacetsFilter.php
@@ -126,6 +126,7 @@ class FacetsFilter extends FilterPluginBase {
     }
 
     $is_processing = TRUE;
+    $form_state->set('uses_facets_exposed_filters', TRUE);
     $form['value'] = $this->facetsViewsGetFacets();
     $is_processing = FALSE;
   }