diff --git a/README.md b/README.md
index 91734a5..d3222d5 100644
--- a/README.md
+++ b/README.md
@@ -2,8 +2,8 @@
 * Contributors: pdargham, julienog, daviddaug, globalis
 * Tags: duplicate, clone, copy, duplication, duplicator, factory, multisite, site, blog, network, wpmu, new blog
 * Requires at least: 4.0.0
-* Tested up to: 4.7.1
-* Stable tag: 1.4.1
+* Tested up to: 4.9.5
+* Stable tag: 1.5.0
 * License: GPLv2 or later
 * License URI: http://www.gnu.org/licenses/gpl-2.0.html
 
@@ -95,6 +95,11 @@ Screenshots on
 
 ## Changelog
 
+### 1.5.0
+* Fix duplicating exponentially usermeta
+* Fix unix WP path validation and allow points
+* Remove cache flushing on error
+
 ### 1.4.1
 * Fix wp_cli activation
 
diff --git a/lib/duplicate.php b/lib/duplicate.php
index 9a0970c..7b2f2cd 100644
--- a/lib/duplicate.php
+++ b/lib/duplicate.php
@@ -52,7 +52,6 @@ public static function duplicate_site($data) {
             $user_id = MUCD_Duplicate::create_admin($email, $domain);
 
             if ( is_wp_error( $user_id ) ) {
-                wp_cache_flush();
                 $form_message['error'] = $user_id->get_error_message();
                 return $form_message;
             }
@@ -63,7 +62,6 @@ public static function duplicate_site($data) {
             $wpdb->show_errors();
 
             if ( is_wp_error( $to_site_id ) ) {
-                wp_cache_flush();
                 $form_message['error'] = $to_site_id->get_error_message();
                 return $form_message;
             }
@@ -140,6 +138,20 @@ public static function copy_users($from_site_id, $to_site_id) {
 
             global $wpdb;
 
+            // Bugfix Pierre Dargham : relocating this declaration outside of the loop
+            // PHP < 5.3
+            function user_array_map( $a ){ return $a[0]; }
+
+            if (is_main_site($from_site_id)) {
+                $is_from_main_site = true;
+                $all_sites_ids = MUCD_Functions::get_sites(['fields' => 'ids']);
+                if(!empty($all_sites_ids)) {
+                    $all_sites_ids = array_map( 'user_array_map', $all_sites_ids );
+                }
+            } else {
+                $is_from_main_site = false;
+            }
+
             // Source Site information
             $from_site_prefix = $wpdb->get_blog_prefix( $from_site_id );                    // prefix 
             $from_site_prefix_length = strlen($from_site_prefix);                           // prefix length
@@ -154,24 +166,23 @@ public static function copy_users($from_site_id, $to_site_id) {
 
             switch_to_blog($to_site_id);
 
-            // Bugfix Pierre Dargham : relocating this declaration outside of the loop
-            // PHP < 5.3
-            function user_array_map( $a ){ return $a[0]; }
-
             foreach ($users as $user) {
                 if($user->user_email != $admin_email) {
 
                     add_user_to_blog( $to_site_id, $user->ID, 'subscriber');
 
-                    // PHP >= 5.3
-                    //$all_meta = array_map( function( $a ){ return $a[0]; }, get_user_meta( $user->ID ) );
-                    // PHP < 5.3
                     $all_meta = array_map( 'user_array_map', get_user_meta( $user->ID ) );
 
                     foreach ($all_meta as $metakey => $metavalue) {
                         $prefix = substr($metakey, 0, $from_site_prefix_length);
                         if($prefix==$from_site_prefix) {
                             $raw_meta_name = substr($metakey,$from_site_prefix_length);
+                            if($is_from_main_site) {
+                                $parts = explode('_', $raw_meta_name, 2);
+                                if (count($parts) > 1 && in_array($parts[0], $all_sites_ids)) {
+                                    continue;
+                                }
+                            }
                             update_user_meta( $user->ID, $to_site_prefix . $raw_meta_name, maybe_unserialize($metavalue) );
                         }
                     }
diff --git a/lib/functions.php b/lib/functions.php
index 05f5baf..90426b3 100644
--- a/lib/functions.php
+++ b/lib/functions.php
@@ -27,7 +27,7 @@ public static function valid_windows_dir_path($path) {
          * @return boolean true | false
          */
     	public static function valid_unix_dir_path($path) {
-    	    $reg = "/^(\/([a-z0-9+\$_-])+)*\/?$/";
+    	    $reg = "/^(\/([a-z0-9+\$_.-])+)*\/?$/";
     	    $bool = preg_match($reg,$path);
     	    return ($bool == 1);
     	}
diff --git a/multisite-clone-duplicator.php b/multisite-clone-duplicator.php
index 52ec6af..e94402b 100644
--- a/multisite-clone-duplicator.php
+++ b/multisite-clone-duplicator.php
@@ -4,11 +4,11 @@
  * Plugin URI:          http://wordpress.org/plugins/multisite-clone-duplicator/
  * Description:         Clones an existing site into a new one in a multisite installation : copies all the posts, settings and files
  * Author:              Julien OGER, Pierre DARGHAM, David DAUGREILH, GLOBALIS media systems
- * Author URI:          https://github.com/pierre-dargham/multisite-clone-duplicator
+ * Author URI:          https://github.com/globalis-ms/multisite-clone-duplicator
  *
- * Version:             1.4.1
+ * Version:             1.5.0
  * Requires at least:   4.0.0
- * Tested up to:        4.7.1
+ * Tested up to:        4.9.5
  *
  * Network:             true
  */
@@ -53,7 +53,7 @@ class MUCD {
         /**
         * Plugin's version number
         */
-        const VERSION = '1.4.1';
+        const VERSION = '1.5.0';
         
         /**
          * Register hooks used by the plugin
diff --git a/readme.txt b/readme.txt
index e4d4fc2..193b53a 100644
--- a/readme.txt
+++ b/readme.txt
@@ -2,8 +2,8 @@
 Contributors: pdargham, julienog, daviddaug, globalis
 Tags: duplicate, clone, copy, duplication, duplicator, factory, multisite, site, blog, network, wpmu, new blog
 Requires at least: 4.0.0
-Tested up to: 4.7.1
-Stable tag: 1.4.1
+Tested up to: 4.9.5
+Stable tag: 1.5.0
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
 
@@ -93,6 +93,11 @@ As of now, following languages are supported : English (en_US), French (fr_FR),
 
 == Changelog ==
 
+= 1.5.0 =
+* Fix duplicating exponentially usermeta
+* Fix unix WP path validation and allow points
+* Remove cache flushing on error
+
 = 1.4.1 =
 * Fix wp_cli activation