diff --git a/CHANGELOG b/CHANGELOG
index 35295e1..fa24dae 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,7 @@
+Version 1.51 August 31, 2015
+------------------------------
+- Fixed notice "Undefined index: template_layers" when download attachment
+
 Version 1.50 August 30, 2015
 ------------------------------
 - Added SMF 2.1 Beta compatibility
diff --git a/CleantalkMod.php b/CleantalkMod.php
index de26d70..ebb386c 100644
--- a/CleantalkMod.php
+++ b/CleantalkMod.php
@@ -16,7 +16,7 @@
 require_once(dirname(__FILE__) . '/cleantalk.class.php');
 
 // define same CleanTalk options
-define('CT_AGENT_VERSION', 'smf-150');
+define('CT_AGENT_VERSION', 'smf-151');
 define('CT_SERVER_URL', 'http://moderate.cleantalk.org');
 define('CT_DEBUG', false);
 
@@ -315,6 +315,7 @@ function cleantalk_load()
 {
     global $context, $user_info;
     if (
+        isset($context['template_layers']) &&
         is_array($context['template_layers']) &&
         in_array('body', $context['template_layers']) &&
         ($user_info['is_guest'] || $user_info['posts'] == 0) &&
@@ -331,6 +332,7 @@ function cleantalk_exit()
 {
     global $context, $user_info;
     if (
+        isset($context['template_layers']) &&
         is_array($context['template_layers']) &&
         in_array('body', $context['template_layers']) &&
         ($user_info['is_guest'] || $user_info['posts'] == 0)
diff --git a/RoboFile.php b/RoboFile.php
index d67f261..3ca074c 100644
--- a/RoboFile.php
+++ b/RoboFile.php
@@ -8,7 +8,7 @@
 class RoboFile extends \Robo\Tasks
 {
     const PACKAGE = 'antispam_cleantalk_smf';
-    const VERSION = '1.50';
+    const VERSION = '1.51';
 
     /**
      * Build SMF zip-package
diff --git a/package-info.xml b/package-info.xml
index 9025a9c..d4a6590 100644
--- a/package-info.xml
+++ b/package-info.xml
@@ -3,7 +3,7 @@
 <package-info xmlns="http://www.simplemachines.org/xml/package-info" xmlns:smf="http://www.simplemachines.org/">
 	<id>cleantalk:antispam</id>
 	<name>Anti-spam by CleanTalk</name>
-	<version>1.50</version>
+	<version>1.51</version>
 	<type>modification</type>
 	<install for="2.0 - 2.1.99">
 		<readme type="file" parsebbc="true">readme.txt</readme>
@@ -77,4 +77,9 @@
 			<![CDATA[[size=14pt][color=red]Please uninstall old version cleantalk mod when installing newer version![/color][/size]]]>
 		</readme>
 	</upgrade>
+	<upgrade from="1.50">
+		<readme type="inline" parsebbc="true">
+			<![CDATA[[size=14pt][color=red]Please uninstall old version cleantalk mod when installing newer version![/color][/size]]]>
+		</readme>
+	</upgrade>
 </package-info>
\ No newline at end of file
diff --git a/readme.txt b/readme.txt
index bf6bc52..5e5b7b4 100644
--- a/readme.txt
+++ b/readme.txt
@@ -1,5 +1,5 @@
 MOD [b]Anti-spam by CleanTalk[/b]
-Version: 1.50
+Version: 1.51
 
 Anti-spam by CleanTalk mod with protection against spam bots and manual spam.
 No Captcha, no questions, no counting animals, no puzzles, no math.