diff --git a/core/modules/forum/forum.module b/core/modules/forum/forum.module
index 4c14535..751b115 100644
--- a/core/modules/forum/forum.module
+++ b/core/modules/forum/forum.module
@@ -14,6 +14,7 @@
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\taxonomy\Entity\Vocabulary;
+use Symfony\Component\Routing\Exception\RouteNotFoundException;
 
 /**
  * Implements hook_help().
@@ -740,7 +741,6 @@ function forum_system_info_alter(&$info, Extension $file, $type) {
     $factory = \Drupal::service('entity.query');
     $nodes = $factory->get('node')
       ->condition('type', 'forum')
-      ->count()
       ->accessCheck(FALSE)
       ->range(0, 1)
       ->execute();
@@ -751,30 +751,38 @@ function forum_system_info_alter(&$info, Extension $file, $type) {
     $vid = \Drupal::config('forum.settings')->get('vocabulary');
     $terms = $factory->get('taxonomy_term')
       ->condition('vid', $vid)
-      ->count()
       ->accessCheck(FALSE)
       ->range(0, 1)
       ->execute();
     if (!empty($terms)) {
       $vocabulary = Vocabulary::load($vid);
       $info['required'] = TRUE;
-      if (!empty($info['explanation'])) {
-        if ($vocabulary->access('view')) {
-          $info['explanation'] = t('To uninstall Forum first delete all <em>Forum</em> content and <a href="!url">%vocabulary</a> terms.', [
-            '%vocabulary' => $vocabulary->label(),
-            '!url' => $vocabulary->url('overview-form'),
-          ]);
+      try {
+        if (!empty($info['explanation'])) {
+          if ($vocabulary->access('view')) {
+            $info['explanation'] = t('To uninstall Forum first delete all <em>Forum</em> content and <a href="!url">%vocabulary</a> terms.', [
+              '%vocabulary' => $vocabulary->label(),
+              '!url' => $vocabulary->url('overview-form'),
+            ]);
+          }
+          else {
+            $info['explanation'] = t('To uninstall Forum first delete all <em>Forum</em> content and %vocabulary terms.', [
+              '%vocabulary' => $vocabulary->label()
+            ]);
+          }
         }
         else {
-          $info['explanation'] = t('To uninstall Forum first delete all <em>Forum</em> content and %vocabulary terms.', [
-            '%vocabulary' => $vocabulary->label()
+          $info['explanation'] = t('To uninstall Forum first delete all <a href="!url">%vocabulary</a> terms.', [
+            '%vocabulary' => $vocabulary->label(),
+            '!url' => $vocabulary->url('overview-form'),
           ]);
         }
       }
-      else {
-        $info['explanation'] = t('To uninstall Forum first delete all <a href="!url">%vocabulary</a> terms.', [
-          '%vocabulary' => $vocabulary->label(),
-          '!url' => $vocabulary->url('overview-form'),
+      catch (RouteNotFoundException $e) {
+        // Route rebuilding might not have occurred before this hook is fired.
+        // Just use an explanation without a link for the time being.
+        $info['explanation'] = t('To uninstall Forum first delete all <em>Forum</em> content and %vocabulary terms.', [
+          '%vocabulary' => $vocabulary->label()
         ]);
       }
     }