diff --git a/core/includes/pager.inc b/core/includes/pager.inc
index 62e8278..c4bce85 100644
--- a/core/includes/pager.inc
+++ b/core/includes/pager.inc
@@ -29,9 +29,12 @@ function pager_find_page($element = 0) {
   $page = \Drupal::request()->query->get('page', '');
   $page_array = explode(',', $page);
   if (!isset($page_array[$element])) {
-    $page_array[$element] = 0;
+    $page_found = 0;
   }
-  return (int) $page_array[$element];
+  else {
+    $page_found = max(0, (int) $page_array[$element]);
+  }
+  return $page_found;
 }
 
 /**
diff --git a/core/lib/Drupal/Core/Entity/Query/QueryBase.php b/core/lib/Drupal/Core/Entity/Query/QueryBase.php
index ed3d12b..1d4cbb1 100644
--- a/core/lib/Drupal/Core/Entity/Query/QueryBase.php
+++ b/core/lib/Drupal/Core/Entity/Query/QueryBase.php
@@ -291,9 +291,9 @@ public function pager($limit = 10, $element = NULL) {
    */
   protected function initializePager() {
     if ($this->pager && !empty($this->pager['limit']) && !$this->count) {
-      $page = pager_find_page($this->pager['element']);
       $count_query = clone $this;
       $this->pager['total'] = $count_query->count()->execute();
+      $page = max(0, min(pager_find_page($this->pager['element']), ((int) ceil($this->pager['total'] / $this->pager['limit'])) - 1));
       $this->pager['start'] = $page * $this->pager['limit'];
       pager_default_initialize($this->pager['total'], $this->pager['limit'], $this->pager['element']);
       $this->range($this->pager['start'], $this->pager['limit']);
diff --git a/core/modules/system/src/Tests/Pager/PagerTest.php b/core/modules/system/src/Tests/Pager/PagerTest.php
index 71413f2..0a49a58 100644
--- a/core/modules/system/src/Tests/Pager/PagerTest.php
+++ b/core/modules/system/src/Tests/Pager/PagerTest.php
@@ -120,6 +120,13 @@ public function testMultiplePagers() {
         'expected_page' => [0 => '3', 1 => '4', 4 => '5'],
         'expected_query' => '?page=2,3,,,4',
       ],
+      // If negative values are passed as page numbers, the first page is
+      // returned.
+      [
+        'input_query' => '?page=-2,-6,,,5',
+        'expected_page' => [0 => '1', 1 => '1', 4 => '6'],
+        'expected_query' => '?page=0,0,,,5',
+      ],
       // If floats are passed as page numbers, only the integer part is
       // returned.
       [