diff -u b/core/modules/system/src/Form/ModulesListForm.php b/core/modules/system/src/Form/ModulesListForm.php
--- b/core/modules/system/src/Form/ModulesListForm.php
+++ b/core/modules/system/src/Form/ModulesListForm.php
@@ -247,8 +247,8 @@
   protected function buildRow(array $modules, Extension $module, $distribution) {
     // Set the basic properties.
     $row['#version'] = $module->info['version'];
-    $row['#requires'] = isset($row['#requires']) ? $row['#requires'] : FALSE;
-    $row['#required_by'] = isset($row['#required_by']) ? $row['#required_by'] : FALSE;
+    $row['#requires'] = array();
+    $row['#required_by'] = array();
 
     // Generate link for module's help page, if there is one.
     $row_links['help'] = array();
@@ -464,9 +464,9 @@
 
     $row['description'] = array(
       '#type' => 'details',
-      '#title' => '<span class="text"> ' . $this->t($module->info['description']) . '</span>',
+      '#title' => $this->t('<span class="text"> ' . $module->info['description'] . '</span>'),
       '#attributes' => array('id' => $id . '-description'),
-      '#description' => $description,
+      '#description' => t($description),
       '#collapsed' => TRUE,
       '#wrapper_attributes' => array(
         'class' => array('description', 'expand'),