diff --git a/src/IDF/Scm/Git.php b/src/IDF/Scm/Git.php
index ca05429..edc1aab 100644
--- a/src/IDF/Scm/Git.php
+++ b/src/IDF/Scm/Git.php
@@ -280,6 +280,14 @@ class IDF_Scm_Git extends IDF_Scm
 
     public static function getAuthAccessUrl($project, $user, $commit=null)
     {
+        // if the user haven't registred a public ssh key,
+        // he can't use the write url which use the SSH authentification
+        if ($user != null) {
+            $keys = $user->get_idf_key_list();
+            if (count ($keys) == 0)
+                return self::getAnonymousAccessUrl($project);
+        } 
+        
         return sprintf(Pluf::f('git_write_remote_url'), $project->shortname);
     }