diff --git a/core/lib/Drupal/Core/Database/StatementPrefetch.php b/core/lib/Drupal/Core/Database/StatementPrefetch.php
index 18dd582..25f2dbd 100644
--- a/core/lib/Drupal/Core/Database/StatementPrefetch.php
+++ b/core/lib/Drupal/Core/Database/StatementPrefetch.php
@@ -284,7 +284,7 @@ class StatementPrefetch implements Iterator, StatementInterface {
         case PDO::FETCH_OBJ:
           return (object) $this->currentRow;
         case PDO::FETCH_CLASS | PDO::FETCH_CLASSTYPE:
-          $class_name = array_unshift($this->currentRow);
+          $class_name = array_shift($this->currentRow);
           // Deliberate no break.
         case PDO::FETCH_CLASS:
           if (!isset($class_name)) {
@@ -308,7 +308,7 @@ class StatementPrefetch implements Iterator, StatementInterface {
           return $this->fetchOptions['object'];
         case PDO::FETCH_COLUMN:
           if (isset($this->columnNames[$this->fetchOptions['column']])) {
-            return $this->currentRow[$k][$this->columnNames[$this->fetchOptions['column']]];
+            return $this->currentRow[$this->columnNames[$this->fetchOptions['column']]];
           }
           else {
             return;