diff -u b/core/modules/views/src/Plugin/views/field/FieldPluginBase.php b/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
--- b/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
+++ b/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
@@ -1173,7 +1173,7 @@
       }
       // This happens here so that renderAsLink can get the unaltered value of
       // this field as a token rather than the altered value.
-      $this->last_render = $value;
+      $this->last_render = (string) $value;
     }
 
     if (empty($this->last_render)) {
reverted:
--- b/core/modules/views/src/Tests/Handler/FieldUnitTest.php
+++ a/core/modules/views/src/Tests/Handler/FieldUnitTest.php
@@ -577,7 +577,7 @@
 
     // Test a valid string.
     $view->result[0]->{$column_map_reversed['name']} = $random_name;
+    $render = $renderer->executeInRenderContext(new RenderContext(), function () use ($view) {
-    $render = (string) $renderer->executeInRenderContext(new RenderContext(), function () use ($view) {
       return $view->field['name']->advancedRender($view->result[0]);
     });
     $this->assertIdentical($render, "", 'If the rewritten string is zero, it should be treated as empty.');