diff --git a/onebuttoninstaller/ext/ext/onebuttoninstaller/fail2ban.postinit b/onebuttoninstaller/ext/ext/onebuttoninstaller/fail2ban.postinit
index 2342955..062392b 100644
--- a/onebuttoninstaller/ext/ext/onebuttoninstaller/fail2ban.postinit
+++ b/onebuttoninstaller/ext/ext/onebuttoninstaller/fail2ban.postinit
@@ -33,20 +33,20 @@
 $command = "fail2ban_start.sh";
 $cmd = dirname(__FILE__)."/".$command;
 require_once("config.inc");
-require_once("functions.inc");
 
 // remove start/stop commands
 // remove existing old rc format entries
 if (is_array($config['rc']) && is_array($config['rc']['postinit']) && is_array( $config['rc']['postinit']['cmd'])) {
-    for ($i = 0; $i < count($config['rc']['postinit']['cmd']); ++$i) {
-        if (preg_match('/$command/', $config['rc']['postinit']['cmd'][$i])) unset($config['rc']['postinit']['cmd'][$i]);
+    $rc_param_count = count($config['rc']['postinit']['cmd']);
+    for ($i = 0; $i < $rc_param_count; $i++) {
+        if (preg_match("/{$command}/", $config['rc']['postinit']['cmd'][$i])) unset($config['rc']['postinit']['cmd'][$i]);
     }
 }
 // remove existing entries for new rc format
-if (is_array($config['rc']) && is_array($config['rc']['param'])) {
+if (is_array($config['rc']) && is_array($config['rc']['param']['0'])) {
 	$rc_param_count = count($config['rc']['param']);
     for ($i = 0; $i < $rc_param_count; $i++) {
-        if (preg_match('/$command/', $config['rc']['param'][$i]['value'])) unset($config['rc']['param'][$i]);
+        if (preg_match("/{$command}/", $config['rc']['param'][$i]['value'])) unset($config['rc']['param'][$i]);
 	}
 }
 
diff --git a/onebuttoninstaller/ext/ext/onebuttoninstaller/mcommander.postinit b/onebuttoninstaller/ext/ext/onebuttoninstaller/mcommander.postinit
index 004d608..e296ced 100644
--- a/onebuttoninstaller/ext/ext/onebuttoninstaller/mcommander.postinit
+++ b/onebuttoninstaller/ext/ext/onebuttoninstaller/mcommander.postinit
@@ -39,12 +39,12 @@ $cmd = dirname(__FILE__)."/".$command;
 // remove existing old rc format entries
 if (is_array($config['rc']) && is_array($config['rc']['postinit']) && is_array( $config['rc']['postinit']['cmd'])) {
     $rc_param_count = count($config['rc']['postinit']['cmd']);
-    for ($i = 0; $i < $rc_param_count; ++$i) {
+    for ($i = 0; $i < $rc_param_count; $i++) {
         if (preg_match("/{$command}/", $config['rc']['postinit']['cmd'][$i])) unset($config['rc']['postinit']['cmd'][$i]);
     }
 }
 // remove existing entries for new rc format
-if (is_array($config['rc']) && is_array($config['rc']['param'])) {
+if (is_array($config['rc']) && is_array($config['rc']['param']['0'])) {
 	$rc_param_count = count($config['rc']['param']);
     for ($i = 0; $i < $rc_param_count; $i++) {
         if (preg_match("/{$command}/", $config['rc']['param'][$i]['value'])) unset($config['rc']['param'][$i]);
diff --git a/onebuttoninstaller/onebuttoninstaller-install.php b/onebuttoninstaller/onebuttoninstaller-install.php
index 482140c..f2cb47f 100644
--- a/onebuttoninstaller/onebuttoninstaller-install.php
+++ b/onebuttoninstaller/onebuttoninstaller-install.php
@@ -29,7 +29,7 @@
     of the authors and should not be interpreted as representing official policies,
     either expressed or implied, of the FreeBSD Project.
 */
-$v = "v0.3.4";      // extension version
+$v = "v0.3.4.1";		// extension version
 $appname = "OneButtonInstaller";
 
 require_once("config.inc");
@@ -111,6 +111,8 @@ if ($release[0] >= 11.0) {	// new rc format
 	$rc_param['comment'] = "Start {$appname} Extension";
 	$rc_param['typeid'] = '2';
 	$rc_param['enable'] = true;
+	if (!is_array($config['rc'])) $config['rc'] = [];
+	if (!is_array($config['rc']['param'])) $config['rc']['param'] = [];
 	$config['rc']['param'][] = $rc_param;
 	$config['onebuttoninstaller']['rc_uuid_start'] = $rc_param['uuid'];
 
@@ -123,6 +125,8 @@ if ($release[0] >= 11.0) {	// new rc format
 	$rc_param['comment'] = "Stop {$appname} Extension";
 	$rc_param['typeid'] = '3';
 	$rc_param['enable'] = true;
+	if (!is_array($config['rc'])) $config['rc'] = [];
+	if (!is_array($config['rc']['param'])) $config['rc']['param'] = [];
 	$config['rc']['param'][] = $rc_param;
 	$config['onebuttoninstaller']['rc_uuid_stop'] = $rc_param['uuid'];
 }
diff --git a/onebuttoninstaller/release_notes.txt b/onebuttoninstaller/release_notes.txt
index 486f190..668ae8c 100644
--- a/onebuttoninstaller/release_notes.txt
+++ b/onebuttoninstaller/release_notes.txt
@@ -1,4 +1,6 @@
 Version Date        Description
+0.3.4.1 2017.02.17  F: installation fails on vanilla systems => http://forums.nas4free.org/viewtopic.php?f=71&t=11189&p=75515#p75357
+
 0.3.4   2016.11.23  N: command scripts rc format for NAS4Free 11.x compatibility
                     N: MidnightCommander: command scripts rc format for NAS4Free 11.x compatibility
                     N: Chinese (Simplified) translation
@@ -8,6 +10,7 @@
                     C: update Spanish translation
                     C: update Ukrainian translation
                     C: MidnightCommander: symlinks for NAS4Free 11.x compatibility
+
 0.3.3   2016.09.01  N: Turkish translation
                     N: Ukrainian translation
                     C: update Dutch translation
@@ -17,16 +20,20 @@
                     C: update Spanish translation
                     C: update Swedish translation
                     F: Configuration - fix table view if unsupported extension exists
+
 0.3.2   2016.08.25  N: Configuration - add checkbox to enable the installation of extensions even if they are already installed
                     N: Swedish translation
                     C: update Greek translation
                     C: update German translation
 0.3.1   2016.08.15  F: OBI installer - add checkbox to override restriction for extensions installation path 
+
 0.3     2016.08.14  N: Configuration - checkbox to override restriction for extensions installation path 
                        (limited to a directory under /mnt/)
+
 0.2     2016.08.09  N: Configuration - enable/disable beta releases in extensions list
                     N: check hardware platform to use midnightcommander on i386 too
                     F: disabling extension not possible, leads to an error message
+
 0.1     2016.08.01  initial release
 
 N: ...  new feature
diff --git a/onebuttoninstaller/version.txt b/onebuttoninstaller/version.txt
index 42045ac..8a19d8d 100644
--- a/onebuttoninstaller/version.txt
+++ b/onebuttoninstaller/version.txt
@@ -1 +1 @@
-0.3.4
+0.3.4.1