diff options
| -rw-r--r-- | modules/book/book.module | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/modules/book/book.module b/modules/book/book.module index d96972a78..5d4ca8124 100644 --- a/modules/book/book.module +++ b/modules/book/book.module @@ -267,7 +267,7 @@ function book_outline($node) { ); $form['nid'] = array('#type' => 'value', '#value' => $nid); - if ($node->parent) { + if (isset($node->parent)) { $form['update'] = array('#type' => 'submit', '#value' => t('Update book outline'), ); |