diff --git a/core/modules/views/src/Plugin/views/filter/Date.php b/core/modules/views/src/Plugin/views/filter/Date.php
index 5928023..7dcc452 100644
--- a/core/modules/views/src/Plugin/views/filter/Date.php
+++ b/core/modules/views/src/Plugin/views/filter/Date.php
@@ -131,7 +131,13 @@ public function acceptExposedInput($input) {
     }
 
     // Store this because it will get overwritten.
-    $type = $this->value['type'];
+    if (array_key_exists('type', $this->value)) {
+      $type = $this->value['type'];
+      $restore_type = TRUE;
+    }
+    else {
+      $restore_type = FALSE;
+    }
     $rc = parent::acceptExposedInput($input);
 
     // Don't filter if value(s) are empty.
@@ -155,7 +161,12 @@ public function acceptExposedInput($input) {
     }
 
     // restore what got overwritten by the parent.
-    $this->value['type'] = $type;
+    if ($restore_type) {
+      $this->value['type'] = $type;
+    }
+    else {
+      unset($this->value['type']);
+    }
     return $rc;
   }