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..aeb1211 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 +76,25 @@ function trigger_menu() {
 }
 
 /**
+ * Access callback: Determines if triggers can be unassigned.
+ *
+ * @return bool
+ *   TRUE if there are triggers that the user can unassign, FALSE otherwise.
+ *
+ * @see trigger_menu()
+ */
+function trigger_menu_unassign_access() {
+  if (!user_access('administer actions')) {
+    return FALSE;
+  }
+  $count = db_select('trigger_assignments')
+    ->countQuery()
+    ->execute()
+    ->fetchField();
+  return $count > 0;
+}
+
+/**
  * Implements hook_trigger_info().
  *
  * Defines all the triggers that this module implements triggers for.
diff --git a/modules/trigger/trigger.test b/modules/trigger/trigger.test
index 138de62..829e189 100644
--- a/modules/trigger/trigger.test
+++ b/modules/trigger/trigger.test
@@ -740,3 +740,32 @@ class TriggerOrphanedActionsTestCase extends DrupalWebTestCase {
     $this->assertRaw(t('!post %title has been updated.', array('!post' => 'Basic page', '%title' => $edit["title"])), t('Make sure the Basic page can be updated with the missing trigger function.'));
   }
 }
+
+/**
+ * Tests the unassigning of triggers.
+ */
+class TriggerUnassignTestCase extends DrupalWebTestCase {
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Trigger unassigning',
+      'description' => 'Tests the unassigning of triggers.',
+      'group' => 'Trigger',
+    );
+  }
+
+  function setUp() {
+    parent::setUp('trigger', 'trigger_test');
+    $web_user = $this->drupalCreateUser(array('administer actions'));
+    $this->drupalLogin($web_user);
+  }
+
+  /**
+   * Tests an attempt to unassign triggers when none are assigned.
+   */
+  function testUnassignAccessDenied() {
+    $this->drupalGet('admin/structure/trigger/unassign');
+    $this->assertResponse(403, 'If there are no actions available, return access denied.');
+  }
+
+}