From bd1dd6ce60bdcfeb77d7d3e26da3f5854eab22b4 Mon Sep 17 00:00:00 2001
From: nguyenanhung <info@nguyenanhung.com>
Date: Fri, 16 Jun 2023 11:21:27 +0700
Subject: [PATCH] fixed v3.2.0

---
 helpers/common.php | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/helpers/common.php b/helpers/common.php
index fe1caaa..ed54b17 100644
--- a/helpers/common.php
+++ b/helpers/common.php
@@ -53,6 +53,9 @@ function codeigniter_hmvc_modules_list($with_location = true)
 if (!function_exists('bear_str_to_lower')) {
 	function bear_str_to_lower($str)
 	{
+		if ($str === null) {
+			return null;
+		}
 		if (function_exists('mb_strtolower')) {
 			return mb_strtolower($str, 'UTF-8');
 		}
@@ -63,6 +66,9 @@ function bear_str_to_lower($str)
 if (!function_exists('bear_str_to_upper')) {
 	function bear_str_to_upper($str)
 	{
+		if ($str === null) {
+			return null;
+		}
 		if (function_exists('mb_strtoupper')) {
 			return mb_strtoupper($str, 'UTF-8');
 		}
@@ -73,6 +79,9 @@ function bear_str_to_upper($str)
 if (!function_exists('bear_str_length')) {
 	function bear_str_length($str)
 	{
+		if ($str === null) {
+			return null;
+		}
 		if (function_exists('mb_strlen')) {
 			return mb_strlen($str);
 		}