diff --git a/modules/trigger/trigger.admin.inc b/modules/trigger/trigger.admin.inc
index 447d0dc..5b607c8 100644
--- a/modules/trigger/trigger.admin.inc
+++ b/modules/trigger/trigger.admin.inc
@@ -53,7 +53,7 @@ function trigger_assign($module_to_display = NULL) {
  * @ingroup forms
  */
 function trigger_unassign($form, $form_state, $module, $hook = NULL, $aid = NULL) {
-  if (!($hook && $aid)) {
+  if (!isset($hook, $aid)) {
     drupal_goto('admin/structure/trigger');
   }
 
diff --git a/modules/trigger/trigger.module b/modules/trigger/trigger.module
index 82d1172..1c869c2 100644
--- a/modules/trigger/trigger.module
+++ b/modules/trigger/trigger.module
@@ -65,7 +65,10 @@ function trigger_menu() {
     'description' => 'Unassign an action from a trigger.',
     'page callback' => 'drupal_get_form',
     'page arguments' => array('trigger_unassign'),
-    'access arguments' => array('administer actions'),
+    // Only accessible if there are any actions that can be unassigned.
+    'access callback' => 'trigger_menu_unassign_access',
+    // Only output in the breadcrumb, not in menu trees.
+    'type' => MENU_VISIBLE_IN_BREADCRUMB,
     'file' => 'trigger.admin.inc',
   );
 
@@ -73,6 +76,17 @@ function trigger_menu() {
 }
 
 /**
+ * Menu access callback for admin/structure/trigger/unassign.
+ */
+function trigger_menu_unassign_access() {
+  if (!user_access('administer actions')) {
+    return FALSE;
+  }
+  $actions = actions_get_all_actions();
+  return !empty($actions);
+}
+
+/**
  * Implements hook_trigger_info().
  *
  * Defines all the triggers that this module implements triggers for.