From f3c6969db0d3aaefb0dfdadb5676093610bbab62 Mon Sep 17 00:00:00 2001
From: Nathan Pitman <nathan@ninefour.co.uk>
Date: Sun, 3 Aug 2014 23:14:25 +0100
Subject: [PATCH] Should fix #10

---
 .../ft.nf_categories_field.php                    | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

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 d95ae86..09eef35 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
@@ -450,7 +450,12 @@ public function save($data) {
 
     public function post_save($data) {
 
-        $selected_cats = array_filter(explode($this->settings['delimiter'], $data)); // array_filter removes empty nodes
+        if (!empty($data)) {
+            // array_filter removes empty nodes
+            $selected_cats = array_filter(explode($this->settings['delimiter'], $data));
+        } else {
+            $selected_cats = array();
+        }
 
         // Just to be sure...
         if ($this->settings['sync_cats']) {
@@ -459,8 +464,12 @@ public function post_save($data) {
             $this->EE->db->select('cat_id');
             $this->EE->db->where('entry_id', $this->settings['entry_id']);
             $current_cats_array = $this->EE->db->get('category_posts')->result_array();
-            foreach($current_cats_array AS $current_cat) {
-                $current_cats[] = $current_cat['cat_id'];
+            if (!empty($current_cats_array)) {
+                foreach($current_cats_array AS $current_cat) {
+                    $current_cats[] = $current_cat['cat_id'];
+                }
+            } else {
+                $current_cats = array();
             }
 
             // Trash cats is current cats minus any selected cats