diff --git a/core/modules/views/src/Plugin/views/filter/StringFilter.php b/core/modules/views/src/Plugin/views/filter/StringFilter.php
index a6fb329..698b6b6 100644
--- a/core/modules/views/src/Plugin/views/filter/StringFilter.php
+++ b/core/modules/views/src/Plugin/views/filter/StringFilter.php
@@ -287,7 +287,7 @@ protected function opContainsWord($field) {
       }
     }
 
-    if (!$where || $where->count() == 0) {
+    if ($where->count() === 0) {
       return;
     }
 
diff --git a/core/modules/views/tests/src/Kernel/Handler/FilterStringTest.php b/core/modules/views/tests/src/Kernel/Handler/FilterStringTest.php
index 8a89d42..e6a2ff8 100644
--- a/core/modules/views/tests/src/Kernel/Handler/FilterStringTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/FilterStringTest.php
@@ -298,7 +298,7 @@ function testFilterStringWord() {
     $view = Views::getView('test_view');
     $view->setDisplay();
 
-    // Change the filtering
+    // Change the filtering to a sting containing only illegal characters.
     $view->displayHandlers->get('default')->overrideOption('filters', array(
       'description' => array(
         'id' => 'description',
@@ -329,7 +329,6 @@ function testFilterStringWord() {
       ),
     );
     $this->assertIdenticalResultset($view, $resultset);
-    $view->destroy();
   }