diff --git a/block_inject.module b/block_inject.module
index b06d3c9..b7b8f10 100644
--- a/block_inject.module
+++ b/block_inject.module
@@ -406,11 +406,13 @@ function block_inject_node_submit($node, $form, &$form_state) {
   $nid = $form_state['values']['nid'];
   $node_type = $form_state['values']['type'];
   $bi = block_inject_find_bi_id($node_type);
-  if ($form_state['values']['block_inject'] == 1) {
-    block_inject_insert_exception($nid, $bi->id);
-  }
-  if ($form_state['values']['block_inject'] == 0) {
-    block_inject_remove_exception('nid', $nid);
+  if (isset($form_state['values']['block_inject'])) {
+    if ($form_state['values']['block_inject'] == 1) {
+      block_inject_insert_exception($nid, $bi->id);
+    }
+    if ($form_state['values']['block_inject'] == 0) {
+      block_inject_remove_exception('nid', $nid);
+    }
   }
 }