diff --git a/core/modules/taxonomy/src/Plugin/views/filter/TaxonomyIndexTid.php b/core/modules/taxonomy/src/Plugin/views/filter/TaxonomyIndexTid.php
index 16d9b77..dfe21ef 100644
--- a/core/modules/taxonomy/src/Plugin/views/filter/TaxonomyIndexTid.php
+++ b/core/modules/taxonomy/src/Plugin/views/filter/TaxonomyIndexTid.php
@@ -271,8 +271,10 @@ protected function valueValidate($form, FormStateInterface $form_state) {
     }
 
     $tids = array();
-    foreach ($form_state->getValue(array('options', 'value')) as $value) {
-      $tids[] = $value['target_id'];
+    if ($values = $form_state->getValue(array('options', 'value'))) {
+      foreach ($values as $value) {
+        $tids[] = $value['target_id'];
+      }
     }
     $form_state->setValue(array('options', 'value'), $tids);
   }