diff --git a/plugins/kolab_addressbook/kolab_addressbook.php b/plugins/kolab_addressbook/kolab_addressbook.php
index d5d7bac6..07c85f17 100644
--- a/plugins/kolab_addressbook/kolab_addressbook.php
+++ b/plugins/kolab_addressbook/kolab_addressbook.php
@@ -256,7 +256,7 @@ class kolab_addressbook extends rcube_plugin
                 // copy group items...
                 if (preg_match('!<ul[^>]*>(.*)</ul>\n*$!Ums', $content, $m)) {
                     $child_html = $m[1] . $child_html;
-                    $content = substr($content, 0, -strlen($m[0]) - 1);
+                    $content = substr($content, 0, -strlen($m[0]));
                 }
                 // ... and re-create the subtree
                 if (!empty($child_html)) {
@@ -334,7 +334,7 @@ class kolab_addressbook extends rcube_plugin
 
         $out = html::tag('li', array(
                 'id' => 'rcmli' . rcube_utils::html_identifier($id, true),
-                'class' => join(' ', $classes), 
+                'class' => join(' ', $classes),
                 'noclose' => true,
             ),
             html::div(!empty($source['subscribed']) ? 'subscribed' : null, $inner)
diff --git a/plugins/kolab_notes/kolab_notes_ui.php b/plugins/kolab_notes/kolab_notes_ui.php
index 855f3352..63660169 100644
--- a/plugins/kolab_notes/kolab_notes_ui.php
+++ b/plugins/kolab_notes/kolab_notes_ui.php
@@ -33,7 +33,7 @@ class kolab_notes_ui
         $this->plugin->include_stylesheet($this->plugin->local_skin_path() . '/notes.css');
 
         $this->ready = true;
-  }
+    }
 
     /**
     * Register handler methods for the template engine
@@ -83,7 +83,7 @@ class kolab_notes_ui
             $select = new html_select($attrib);
         }
 
-        $tree  = $is_select ? true : null;
+        $tree  = !$is_select ? true : null;
         $lists = $this->plugin->get_lists($tree);
         $jsenv = array();
 
diff --git a/plugins/libkolab/lib/kolab_storage_folder.php b/plugins/libkolab/lib/kolab_storage_folder.php
index 55457621..a61922f4 100644
--- a/plugins/libkolab/lib/kolab_storage_folder.php
+++ b/plugins/libkolab/lib/kolab_storage_folder.php
@@ -129,7 +129,7 @@ class kolab_storage_folder extends kolab_storage_folder_api
         $ns     = $this->get_namespace();
         $nsdata = $this->imap->get_namespace($ns);
 
-        if (is_array($nsdata[0]) && strlen($nsdata[0][0]) && strpos($this->name, $nsdata[0][0]) === 0) {
+        if (!empty($nsdata[0][0]) && strpos($this->name, $nsdata[0][0]) === 0) {
             $subpath = substr($this->name, strlen($nsdata[0][0]));
             if ($ns == 'other') {
                 list($user, $suffix) = explode($nsdata[0][1], $subpath, 2);