diff --git a/core/modules/taxonomy/tests/src/Kernel/Views/ArgumentValidatorTermTest.php b/core/modules/taxonomy/tests/src/Kernel/Views/ArgumentValidatorTermTest.php
index aa4269afc5..75e38fe35a 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Views/ArgumentValidatorTermTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Views/ArgumentValidatorTermTest.php
@@ -61,6 +61,10 @@ public function testArgumentValidatorTerm() {
     $view->initHandlers();
 
     // Test the single validator for term IDs.
+    // @todo $view->argument['tid']->validator should be defined, but it's not
+    // here and that's leading to test failures in PHP 7.4. Figure out a more
+    // robust solution rather than creating the stdClass object in the test.
+    $view->argument['tid']->validator = new \stdClass();
     $view->argument['tid']->validator->options['type'] = 'tid';
 
     // Pass in a single valid term.