diff --git a/contrib/search_api_views/includes/handler_filter_user.inc b/contrib/search_api_views/includes/handler_filter_user.inc
index 563c3eb..0cfba71 100644
--- a/contrib/search_api_views/includes/handler_filter_user.inc
+++ b/contrib/search_api_views/includes/handler_filter_user.inc
@@ -53,34 +53,52 @@ class SearchApiViewsHandlerFilterUser extends SearchApiViewsHandlerFilter {
     $path = $this->isMultiValued() ? 'admin/views/ajax/autocomplete/user' : 'user/autocomplete';
     $form['value']['#autocomplete_path'] = $path;
 
-    // Set the correct default value in case the admin-set value is used.
-    if ($this->value && empty($form_state['input'])) {
-      $values = array();
-      $args[':uids'] = array_filter($this->value);
-      $result = db_query("SELECT uid, name FROM {users} u WHERE uid IN (:uids)", $args);
-      $result = $result->fetchAllKeyed();
-      foreach ($this->value as $uid) {
-        if (!$uid) {
-          $values[] = 'Anonymous';
-        }
-        elseif (isset($result[$uid])) {
-          $values[] = $result[$uid];
-        }
+    // Set the correct default value in case the admin-set value is used (and a
+    // value is present). The value is used if the form is either not exposed,
+    // or the exposed form wasn't submitted yet (there is
+    if ($this->value && (empty($form_state['input']) || !empty($form_state['input']['live_preview']))) {
+      $form['value']['#default_value'] = $this->uids_to_names($this->value);
+    }
+  }
+
+  /**
+   * Transforms an array of UIDs into a comma-separated list of names.
+   *
+   * @param array $uids
+   *   The UIDs to transform.
+   *
+   * @return string
+   *   A string containing the names corresponding to the UIDs, separated by
+   *   commas.
+   */
+  protected function uids_to_names(array $uids) {
+    $names = array();
+    $args[':uids'] = array_filter($uids);
+    $result = db_query("SELECT uid, name FROM {users} u WHERE uid IN (:uids)", $args);
+    $result = $result->fetchAllKeyed();
+    foreach ($uids as $uid) {
+      if (!$uid) {
+        $names[] = 'Anonymous';
+      }
+      elseif (isset($result[$uid])) {
+        $names[] = $result[$uid];
       }
-      $form['value']['#default_value'] = implode(', ', $values);
     }
+    return implode(', ', $names);
   }
 
   /**
    * {@inheritdoc}
    */
   public function value_validate($form, &$form_state) {
-    $value = &$form_state['values']['options']['value'];
-    $values = $this->isMultiValued() ? drupal_explode_tags($value) : array($value);
-    $uids = $this->validate_user_strings($form['value'], $values);
+    if (!empty($form['value'])) {
+      $value = &$form_state['values']['options']['value'];
+      $values = $this->isMultiValued($form_state['values']['options']) ? drupal_explode_tags($value) : array($value);
+      $uids = $this->validate_user_strings($form['value'], $values);
 
-    if ($uids) {
-      $value = $uids;
+      if ($uids) {
+        $value = $uids;
+      }
     }
   }
 
@@ -175,11 +193,16 @@ class SearchApiViewsHandlerFilterUser extends SearchApiViewsHandlerFilter {
    * This is either the case if the form isn't exposed, or if the " Allow
    * multiple selections" option is enabled.
    *
+   * @param array $options
+   *   (optional) The options array to use. If not supplied, the options set on
+   *   this filter will be used.
+   *
    * @return bool
    *   TRUE if multiple values can be entered for this filter, FALSE otherwise.
    */
-  protected function isMultiValued() {
-    return empty($this->options['exposed']) || !empty($this->options['expose']['multiple']);
+  protected function isMultiValued(array $options = array()) {
+    $options = $options ? $options : $this->options;
+    return empty($options['exposed']) || !empty($options['expose']['multiple']);
   }
 
   /**
@@ -187,7 +210,7 @@ class SearchApiViewsHandlerFilterUser extends SearchApiViewsHandlerFilter {
    */
   public function admin_summary() {
     $value = $this->value;
-    $this->value = implode(', ', $value);
+    $this->value = empty($value) ? '' : $this->uids_to_names($value);
     $ret = parent::admin_summary();
     $this->value = $value;
     return $ret;