diff --git a/dvg_appointments.module b/dvg_appointments.module
index 25d9251..d4fad6f 100644
--- a/dvg_appointments.module
+++ b/dvg_appointments.module
@@ -1851,25 +1851,29 @@ function _dvg_appointments_get_task_confirm_text_by_product_code($product_code)
  *   Rendered output.
  */
 function _dvg_appointments_create_info($appointment, $html = TRUE) {
-  $confirm_text = $appointment_tables = $output = array();
-
-  $markup = array(
-    '#markup' => _dvg_appointments_table($appointment, $html),
-    '#prefix' => '<div class="appointments-info-table-container">',
-    '#suffix' => '</div>',
-  );
-  $output[] = render($markup);
-
+  if ($appointment) {
+    $confirm_text = $appointment_tables = $output = array();
+    $markup = array(
+      '#markup' => _dvg_appointments_table($appointment, $html),
+      '#prefix' => '<div class="appointments-info-table-container">',
+      '#suffix' => '</div>',
+    );
+    $output[] = render($markup);
 
-  foreach ($appointment->getProductIds() as $product_id) {
-    $confirm_text[] = _dvg_appointments_get_task_confirm_text_by_product_code($product_id);
-  }
 
-  $output[] = implode('<br />', $confirm_text);
+    foreach ($appointment->getProductIds() as $product_id) {
+      $confirm_text[] = _dvg_appointments_get_task_confirm_text_by_product_code($product_id);
+    }
 
-  $output = implode("\n", $output);
+    $output[] = implode('<br />', $confirm_text);
+    $output = implode("\n", $output);
 
-  return ($html) ? $output : drupal_html_to_text($output);
+    return ($html) ? $output : drupal_html_to_text($output);
+  }
+  else {
+    watchdog('dvg_appointments', 'An appointment confirmation page was loaded, but there is no appointment. Maybe it is already canceled in another window?');
+    drupal_goto('node/' . variable_get('functional_content_nid__dvg_appointments_create'));
+  }
 }
 
 /**