diff --git a/MappedLuns-and-Luns-max-number-is-not-the-same-anymore.patch b/MappedLuns-and-Luns-max-number-is-not-the-same-anymore.patch
new file mode 100644
index 0000000000000000000000000000000000000000..6d47daf5ec2701a0683485608610d9eaee151b20
--- /dev/null
+++ b/MappedLuns-and-Luns-max-number-is-not-the-same-anymore.patch
@@ -0,0 +1,22 @@
+From 598f988cb90e318a62a164cadb2045f4e6778bda Mon Sep 17 00:00:00 2001
+From: Pavel Zakharov <pavel.zakharov@delphix.com>
+Date: Tue, 20 Feb 2018 17:53:20 -0500
+Subject: [PATCH] MappedLuns and Luns max number is not the same anymore
+
+---
+ targetcli/ui_target.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/targetcli/ui_target.py b/targetcli/ui_target.py
+index 87c5a2a..6895b38 100644
+--- a/targetcli/ui_target.py
++++ b/targetcli/ui_target.py
+@@ -1141,7 +1141,7 @@ def ui_command_create(self, storage_object, lun=None,
+                 existing_mluns = [mlun.mapped_lun for mlun in acl.mapped_luns]
+                 if mapped_lun in existing_mluns:
+                     mapped_lun = None
+-                    for possible_mlun in six.moves.range(LUN.MAX_LUN):
++                    for possible_mlun in six.moves.range(MappedLUN.MAX_LUN):
+                         if possible_mlun not in existing_mluns:
+                             mapped_lun = possible_mlun
+                             break
diff --git a/targetcli.spec b/targetcli.spec
index 0247d4f9469195fff70f1574662559aa92a73698..e50ae42e740b0f120768ce600db8c5e1179c5ea0 100644
--- a/targetcli.spec
+++ b/targetcli.spec
@@ -1,11 +1,12 @@
 Name:           targetcli
 Version:        2.1.fb48
-Release:        9
+Release:        10
 License:        ASL 2.0
 Summary:        Generic SCSI target CLI shell
 URL:            https://github.com/open-iscsi/targetcli-fb
 Source:         https://github.com/open-iscsi/targetcli-fb/archive/v2.1.fb48.tar.gz
 Patch0000:      0000-signed-char.patch
+Patch0001:      MappedLuns-and-Luns-max-number-is-not-the-same-anymore.patch
 BuildArch:      noarch
 BuildRequires:  python3-devel python3-setuptools
 Requires:       python3-rtslib target-restore python3-configshell python3-six python3-dbus python3-gobject
@@ -43,5 +44,8 @@ install -D -m 644 targetcli.8.gz %{buildroot}%{_mandir}/man8/targetcli.8.gz
 %{_mandir}/man8/targetcli.8.gz
 
 %changelog
+* Wed Jul 15 2020 wangyue <wangyue92@huawei.com> - 2.1.fb48-10
+- fix unexpected error raised when adding luns 
+
 * Fri Feb 14 2020 lingsheng <lingsheng@huawei.com> - 2.1.fb48-9
 - Package int