diff -u b/core/modules/tracker/tests/src/Functional/TrackerTest.php b/core/modules/tracker/tests/src/Functional/TrackerTest.php
--- b/core/modules/tracker/tests/src/Functional/TrackerTest.php
+++ b/core/modules/tracker/tests/src/Functional/TrackerTest.php
@@ -155,8 +155,8 @@
     ]);
 
     $this->drupalGet('user/' . $this->user->id() . '/activity');
-    $this->assertSession()->pageTextNotContains($nodes['unpublished']->label(), "Unpublished nodes do not show up in the user's tracker listing.");
-    $this->assertSession()->pageTextContains($nodes['my_published']->label(), "Published nodes show up in the user's tracker listing.");
+    $this->assertSession()->pageTextNotContains($nodes['unpublished']->label());
+    $this->assertSession()->pageTextContains($nodes['my_published']->label());
 
     // Assert cache contexts.
     $this->assertCacheContexts([
only in patch2:
unchanged:
--- a/core/modules/tracker/src/Controller/TrackerController.php
+++ b/core/modules/tracker/src/Controller/TrackerController.php
@@ -68,7 +68,7 @@ class TrackerController extends ControllerBase {
    * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entityTypeManager
    *   The entity type manager.
    */
-  public function __construct(Connection $database, Connection $databaseReplica, CommentStatisticsInterface $commentStatistics, DateFormatterInterface $dateFormatter, EntityTypeManagerInterface $entityTypeManager) {
+  public function __construct(Connection $database, Connection $databaseReplica, CommentStatisticsInterface $commentStatistics = NULL, DateFormatterInterface $dateFormatter, EntityTypeManagerInterface $entityTypeManager) {
     $this->database = $database;
     $this->databaseReplica = $databaseReplica;
     $this->commentStatistics = $commentStatistics;
@@ -81,10 +81,15 @@ public function __construct(Connection $database, Connection $databaseReplica, C
    * {@inheritdoc}
    */
   public static function create(ContainerInterface $container) {
+    $comment_service = NULL;
+    if (\Drupal::hasService('comment.statistics')) {
+      $comment_service = $container->get('comment.statistics');
+    }
+
     return new static(
       $container->get('database'),
       $container->get('database.replica'),
-      $container->get('comment.statistics'),
+      $comment_service,
       $container->get('date.formatter'),
       $container->get('entity_type.manager')
     );
@@ -141,6 +146,11 @@ public function buildContent(UserInterface $user = NULL) {
         ->addMetaData('base_table', 'tracker_node');
     }
 
+    $comment_installed = FALSE;
+    if (isset($this->commentStatistics)) {
+      $comment_installed = TRUE;
+    }
+
     // This array acts as a placeholder for the data selected later
     // while keeping the correct order.
     $tracker_data = $query
@@ -160,24 +170,26 @@ public function buildContent(UserInterface $user = NULL) {
       $nodes = $this->nodeStorage->loadMultiple(array_keys($tracker_data));
 
       // Enrich the node data.
-      $result = $this->commentStatistics->read($nodes, 'node', FALSE);
-      foreach ($result as $statistics) {
-        // The node ID may not be unique; there can be multiple comment fields.
-        // Make comment_count the total of all comments.
-        $nid = $statistics->entity_id;
-        if (empty($nodes[$nid]->comment_count)
-          || !is_numeric($tracker_data[$nid]->comment_count)) {
-          $tracker_data[$nid]->comment_count = $statistics->comment_count;
-        }
-        else {
-          $tracker_data[$nid]->comment_count += $statistics->comment_count;
-        }
-        // Make the last comment timestamp reflect the latest comment.
-        if (!isset($tracker_data[$nid]->last_comment_timestamp)) {
-          $tracker_data[$nid]->last_comment_timestamp = $statistics->last_comment_timestamp;
-        }
-        else {
-          $tracker_data[$nid]->last_comment_timestamp = max($tracker_data[$nid]->last_comment_timestamp, $statistics->last_comment_timestamp);
+      if ($comment_installed) {
+        $result = $this->commentStatistics->read($nodes, 'node', FALSE);
+        foreach ($result as $statistics) {
+          // The node ID may not be unique; there can be multiple comment fields.
+          // Make comment_count the total of all comments.
+          $nid = $statistics->entity_id;
+          if (empty($nodes[$nid]->comment_count)
+            || !is_numeric($tracker_data[$nid]->comment_count)) {
+            $tracker_data[$nid]->comment_count = $statistics->comment_count;
+          }
+          else {
+            $tracker_data[$nid]->comment_count += $statistics->comment_count;
+          }
+          // Make the last comment timestamp reflect the latest comment.
+          if (!isset($tracker_data[$nid]->last_comment_timestamp)) {
+            $tracker_data[$nid]->last_comment_timestamp = $statistics->last_comment_timestamp;
+          }
+          else {
+            $tracker_data[$nid]->last_comment_timestamp = max($tracker_data[$nid]->last_comment_timestamp, $statistics->last_comment_timestamp);
+          }
         }
       }
 
@@ -205,11 +217,6 @@ public function buildContent(UserInterface $user = NULL) {
               '#account' => $owner,
             ],
           ],
-          'comments' => [
-            'class' => ['comments'],
-            'data' => $tracker_data[$node->id()]->comment_count ?? 0,
-            'data-history-node-last-comment-timestamp' => $tracker_data[$node->id()]->last_comment_timestamp ?? 0,
-          ],
           'last updated' => [
             'data' => t('@time ago', [
               '@time' => $this->dateFormatter->formatTimeDiffSince($last_activity),
@@ -217,6 +224,17 @@ public function buildContent(UserInterface $user = NULL) {
           ],
         ];
 
+        if ($comment_installed) {
+          $comment_row = [
+            'comments' => [
+            'class' => ['comments'],
+            'data' => $tracker_data[$node->id()]->comment_count ?? 0,
+            'data-history-node-last-comment-timestamp' => $tracker_data[$node->id()]->last_comment_timestamp ?? 0,
+            ],
+          ];
+          $row = array_slice($row, 0, 3) + $comment_row + array_slice($row, 3);
+        }
+
         $rows[] = $row;
 
         // Add node and node owner to cache tags.
@@ -236,12 +254,19 @@ public function buildContent(UserInterface $user = NULL) {
         $this->t('Type'),
         $this->t('Title'),
         $this->t('Author'),
-        $this->t('Comments'),
         $this->t('Last updated'),
       ],
       '#type' => 'table',
       '#empty' => $this->t('No content available.'),
     ];
+
+    if ($comment_installed) {
+      $comment_header = [$this->t('Comments')];
+      $beginning = array_slice($page['tracker']['#header'], 0, 3);
+      $end = array_slice($page['tracker']['#header'], 3);
+      $page['tracker']['#header'] = array_merge($beginning, $comment_header, $end);
+    }
+
     $page['pager'] = [
       '#type' => 'pager',
       '#weight' => 10,