diff --git a/acl.module b/acl.module
index 7a27ef8..c1d9f7e 100644
--- a/acl.module
+++ b/acl.module
@@ -101,18 +101,22 @@ function acl_edit_form(&$form_state, $acl_id, $label = NULL, $new_acl = FALSE) {
  * Provide access control to all nodes selected by a subquery, based upon an ACL id.
  */
 function acl_add_nodes($subselect, $acl_id, $view, $update, $delete, $priority = 0) {
-  db_delete('acl_node')
-    ->condition('acl_id', $acl_id)
-    ->condition('nid', $subselect, 'IN')
-    ->execute();
-  $subselect->addExpression($acl_id, 'acl_id');
-  $subselect->addExpression((int) $view, 'grant_view');
-  $subselect->addExpression((int) $update, 'grant_update');
-  $subselect->addExpression((int) $delete, 'grant_delete');
-  $subselect->addExpression($priority, 'priority');
-  db_insert('acl_node')
-    ->from($subselect)
-    ->execute();
+  $nidscheck = $subselect;
+  $nids = $nidscheck->range(1, 1)->execute()->fetchAllKeyed(0, 0);
+  if (!empty($nids)) {
+    db_delete('acl_node')
+      ->condition('acl_id', $acl_id)
+      ->condition('nid', $subselect, 'IN')
+      ->execute();
+    $subselect->addExpression($acl_id, 'acl_id');
+    $subselect->addExpression((int) $view, 'grant_view');
+    $subselect->addExpression((int) $update, 'grant_update');
+    $subselect->addExpression((int) $delete, 'grant_delete');
+    $subselect->addExpression($priority, 'priority');
+    db_insert('acl_node')
+      ->from($subselect)
+      ->execute();
+  }
 }
 
 /**