diff --git a/system/third_party/nf_categories_field/config.php b/system/third_party/nf_categories_field/config.php
index 4e79367..44429e9 100644
--- a/system/third_party/nf_categories_field/config.php
+++ b/system/third_party/nf_categories_field/config.php
@@ -12,7 +12,7 @@
 if ( ! defined('NF_CF_NAME'))
 {
     define('NF_CF_NAME',    'Categories Field');
-    define('NF_CF_VERSION', '1.0.7');
+    define('NF_CF_VERSION', '1.0.8');
     define('NF_CF_DOCS',    'http://github.com/ninefour/categories_field.ft.ee_addon');
 }
 
diff --git a/system/third_party/nf_categories_field/ft.nf_categories_field.php b/system/third_party/nf_categories_field/ft.nf_categories_field.php
index f1f332a..c150039 100644
--- a/system/third_party/nf_categories_field/ft.nf_categories_field.php
+++ b/system/third_party/nf_categories_field/ft.nf_categories_field.php
@@ -579,7 +579,7 @@ function replace_primary_category_id($data, $params = array(), $tagdata = FALSE)
         // array_filter removes empty nodes, array_values re-indexes
         $categories = array_values(array_filter(explode($settings['delimiter'], $data)));
 
-        if (substr( $categories[0], 0, 1 ) === "p") {
+        if ($categories AND substr( $categories[0], 0, 1 ) === "p") {
             $primary_cat_id = ltrim($categories[0],'p');
         }