diff --git a/workbench_access.admin.inc b/workbench_access.admin.inc
index c69c2c6..730c3ff 100644
--- a/workbench_access.admin.inc
+++ b/workbench_access.admin.inc
@@ -16,26 +16,27 @@ function workbench_access_settings_form($form, &$form_state) {
   foreach ($info as $key => $value) {
     $options[$key] = $value['name'] . '<div class="description">' . $value['description'] . '</div>';
   }
-  $active = variable_get('workbench_access');
-  $form = array();
-  $form['help'] = array(
-    '#markup' => '<h2>' . t('Workbench Access settings') . '</h2>',
-  );
-  // Check for proper installation.
-  if (module_exists('taxonomy')) {
-    $vocabulary = workbench_access_sample_vocabulary();
-    $exists = workbench_access_vocabulary_exists($vocabulary);
-    if (!$exists && (empty($active) || $active == 'taxonomy')) {
-      $form['help']['#markup'] .= '<p>' . t('Install the <a href="!url">test configuration for Workbench</a>.', array('!url' => url('admin/config/workbench/access/install'))) .'</p>';
+  if (!empty($options)) {
+    $active = variable_get('workbench_access');
+    $form = array();
+    $form['help'] = array(
+      '#markup' => '<h2>' . t('Workbench Access settings') . '</h2>',
+    );
+    // Check for proper installation.
+    if (module_exists('taxonomy')) {
+      $vocabulary = workbench_access_sample_vocabulary();
+      $exists = workbench_access_vocabulary_exists($vocabulary);
+      if (!$exists && (empty($active) || $active == 'taxonomy')) {
+        $form['help']['#markup'] .= '<p>' . t('Install the <a href="!url">test configuration for Workbench</a>.', array('!url' => url('admin/config/workbench/access/install'))) .'</p>';
+      }
     }
-  }
-  $form['workbench_access'] = array(
-    '#type' => 'radios',
-    '#title' => t('Active access scheme'),
-    '#options' => $options,
-    '#description' => t('Select the access scheme to use for the site.'),
-    '#required' => TRUE,
-  );
+    $form['workbench_access'] = array(
+      '#type' => 'radios',
+      '#title' => t('Active access scheme'),
+      '#options' => $options,
+      '#description' => t('Select the access scheme to use for the site.'),
+      '#required' => TRUE,
+    );
   if ($active) {
     $form['workbench_access']['#default_value'] = $active;
   }
@@ -166,6 +167,9 @@ function workbench_access_settings_form($form, &$form_state) {
   $form['#validate'][] = 'workbench_access_settings_validate';
   $form['#submit'][] = 'workbench_access_settings_submit';
   return $form;
+  } else {
+    drupal_set_message('Workbench Access requires a hierarchical access scheme. At least module such as Menu or Taxonomy must be enabled in order to define one.', 'warning');
+  }
 }
 
 /**