From 7545019f7f73eac64737d231516cb0b5d22391ab Mon Sep 17 00:00:00 2001
From: Kevin <klis.kevin@gmail.com>
Date: Tue, 22 Jan 2019 13:58:59 +0100
Subject: [PATCH] Fixed error on non existent parent

---
 src/Tree.php | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/Tree.php b/src/Tree.php
index b4a89a0..fddff5a 100644
--- a/src/Tree.php
+++ b/src/Tree.php
@@ -202,6 +202,13 @@ public function build($data)
         $this->nodes = [];
         $children = [];
 
+        // Check for non existent parents
+        foreach ($data as $i => $item) {
+            if(!in_array($item['parent_category_id'], array_column($data, 'id'))) { // search value in the array
+                $data[$i]['parent_category_id'] = '';
+            }
+        }
+
         // Create the root node
         $this->nodes[$this->rootId] = $this->createNode($this->rootId, null, []);