From bf801fc11d96ee1d868028ba270d2a166c915769 Mon Sep 17 00:00:00 2001
From: Quatadah Nasdami <quatadah.nasdami@gmail.com>
Date: Wed, 15 Jun 2022 16:50:34 +0200
Subject: [PATCH 1/2] temporary transformation (from string to array) so it can
 be traversable

---
 htdocs/core/class/extrafields.class.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/htdocs/core/class/extrafields.class.php b/htdocs/core/class/extrafields.class.php
index 4f9b0d06f16..33b36b9dd47 100644
--- a/htdocs/core/class/extrafields.class.php
+++ b/htdocs/core/class/extrafields.class.php
@@ -1268,7 +1268,8 @@ class ExtraFields
 					require_once DOL_DOCUMENT_ROOT.'/categories/class/categorie.class.php';
 					$data = $form->select_all_categories(Categorie::$MAP_ID_TO_CODE[$InfoFieldList[5]], '', 'parent', 64, $InfoFieldList[6], 1, 1);
 					$out .= '<option value="0">&nbsp;</option>';
-					foreach ($data as $data_key => $data_value) {
+					$dataArray = str_split($data); // as $data is not traversable as it's a string
+					foreach ($dataArray as $data_key => $data_value) {
 						$out .= '<option value="'.$data_key.'"';
 						$out .= ($value == $data_key ? ' selected' : '');
 						$out .= '>'.$data_value.'</option>';

From fb410843f9b52262d0ce1665a4449b03e1bb8b6d Mon Sep 17 00:00:00 2001
From: Quatadah Nasdami <quatadah.nasdami@gmail.com>
Date: Thu, 23 Jun 2022 18:00:58 +0200
Subject: [PATCH 2/2] adding condition to verify that variable is an array and
 not string

---
 htdocs/core/class/extrafields.class.php | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/htdocs/core/class/extrafields.class.php b/htdocs/core/class/extrafields.class.php
index 33b36b9dd47..14bb1fb6bf1 100644
--- a/htdocs/core/class/extrafields.class.php
+++ b/htdocs/core/class/extrafields.class.php
@@ -1268,11 +1268,12 @@ class ExtraFields
 					require_once DOL_DOCUMENT_ROOT.'/categories/class/categorie.class.php';
 					$data = $form->select_all_categories(Categorie::$MAP_ID_TO_CODE[$InfoFieldList[5]], '', 'parent', 64, $InfoFieldList[6], 1, 1);
 					$out .= '<option value="0">&nbsp;</option>';
-					$dataArray = str_split($data); // as $data is not traversable as it's a string
-					foreach ($dataArray as $data_key => $data_value) {
-						$out .= '<option value="'.$data_key.'"';
-						$out .= ($value == $data_key ? ' selected' : '');
-						$out .= '>'.$data_value.'</option>';
+					if (is_array($data)) {
+						foreach ($data as $data_key => $data_value) {
+							$out .= '<option value="'.$data_key.'"';
+							$out .= ($value == $data_key ? ' selected' : '');
+							$out .= '>'.$data_value.'</option>';
+						}
 					}
 				}
 			}