diff --git a/plugins/calendar/drivers/kolab/kolab_calendar.php b/plugins/calendar/drivers/kolab/kolab_calendar.php
index e20133e1..d5efb219 100644
--- a/plugins/calendar/drivers/kolab/kolab_calendar.php
+++ b/plugins/calendar/drivers/kolab/kolab_calendar.php
@@ -279,7 +279,7 @@ class kolab_calendar
     $saved = $this->storage->save($object, 'event');
     
     if (!$saved) {
-      raise_error(array(
+      rcube::raise_error(array(
         'code' => 600, 'type' => 'php',
         'file' => __FILE__, 'line' => __LINE__,
         'message' => "Error saving event object to Kolab server"),
@@ -313,7 +313,7 @@ class kolab_calendar
     $saved = $this->storage->save($object, 'event', $event['id']);
 
     if (!$saved) {
-      raise_error(array(
+      rcube::raise_error(array(
         'code' => 600, 'type' => 'php',
         'file' => __FILE__, 'line' => __LINE__,
         'message' => "Error saving event object to Kolab server"),
@@ -338,7 +338,7 @@ class kolab_calendar
     $deleted = $this->storage->delete($event['id'], $force);
 
     if (!$deleted) {
-      raise_error(array(
+      rcube::raise_error(array(
         'code' => 600, 'type' => 'php',
         'file' => __FILE__, 'line' => __LINE__,
         'message' => "Error deleting event object from Kolab server"),
@@ -360,7 +360,7 @@ class kolab_calendar
         return true;
     }
     else {
-        raise_error(array(
+        rcube::raise_error(array(
           'code' => 600, 'type' => 'php',
           'file' => __FILE__, 'line' => __LINE__,
           'message' => "Error undeleting the event object $uid from the Kolab server"),
diff --git a/plugins/calendar/drivers/kolab/kolab_driver.php b/plugins/calendar/drivers/kolab/kolab_driver.php
index 609d81b0..4bc1f637 100644
--- a/plugins/calendar/drivers/kolab/kolab_driver.php
+++ b/plugins/calendar/drivers/kolab/kolab_driver.php
@@ -466,7 +466,7 @@ class kolab_driver extends calendar_driver
     $old = $master = $fromcalendar->get_event($event['id']);
 
     if (!$old || !$old['start']) {
-      raise_error(array(
+      rcube::raise_error(array(
         'code' => 600, 'type' => 'php',
         'file' => __FILE__, 'line' => __LINE__,
         'message' => "Failed to load event object to update: id=" . $event['id']),
@@ -927,7 +927,7 @@ class kolab_driver extends calendar_driver
     // trigger updates on folder
     $trigger = $cal->storage->trigger();
     if (is_object($trigger) && is_a($trigger, 'PEAR_Error')) {
-      raise_error(array(
+      rcube::raise_error(array(
         'code' => 900, 'type' => 'php',
         'file' => __FILE__, 'line' => __LINE__,
         'message' => "Failed triggering folder. Error was " . $trigger->getMessage()),
diff --git a/plugins/kolab_addressbook/kolab_addressbook.php b/plugins/kolab_addressbook/kolab_addressbook.php
index 3ec072e5..a85965ee 100644
--- a/plugins/kolab_addressbook/kolab_addressbook.php
+++ b/plugins/kolab_addressbook/kolab_addressbook.php
@@ -236,7 +236,7 @@ class kolab_addressbook extends rcube_plugin
         $this->folders = kolab_storage::get_folders('contact');
 
         if (PEAR::isError($this->folders)) {
-            raise_error(array(
+            rcube::raise_error(array(
               'code' => 600, 'type' => 'php',
               'file' => __FILE__, 'line' => __LINE__,
               'message' => "Failed to list contact folders from Kolab server:" . $this->folders->getMessage()),
diff --git a/plugins/kolab_addressbook/lib/rcube_kolab_contacts.php b/plugins/kolab_addressbook/lib/rcube_kolab_contacts.php
index 1c179330..756f5144 100644
--- a/plugins/kolab_addressbook/lib/rcube_kolab_contacts.php
+++ b/plugins/kolab_addressbook/lib/rcube_kolab_contacts.php
@@ -562,7 +562,7 @@ class rcube_kolab_contacts extends rcube_addressbook
             $saved = $this->storagefolder->save($object, 'contact');
 
             if (!$saved) {
-                raise_error(array(
+                rcube::raise_error(array(
                   'code' => 600, 'type' => 'php',
                   'file' => __FILE__, 'line' => __LINE__,
                   'message' => "Error saving contact object to Kolab server"),
@@ -596,7 +596,7 @@ class rcube_kolab_contacts extends rcube_addressbook
             $object = $this->_from_rcube_contact($save_data, $old);
 
             if (!$this->storagefolder->save($object, 'contact', $old['uid'])) {
-                raise_error(array(
+                rcube::raise_error(array(
                   'code' => 600, 'type' => 'php',
                   'file' => __FILE__, 'line' => __LINE__,
                   'message' => "Error saving contact object to Kolab server"),
@@ -636,7 +636,7 @@ class rcube_kolab_contacts extends rcube_addressbook
                 $deleted = $is_mailto || $this->storagefolder->delete($uid, $force);
 
                 if (!$deleted) {
-                    raise_error(array(
+                    rcube::raise_error(array(
                       'code' => 600, 'type' => 'php',
                       'file' => __FILE__, 'line' => __LINE__,
                       'message' => "Error deleting a contact object $uid from the Kolab server"),
@@ -680,7 +680,7 @@ class rcube_kolab_contacts extends rcube_addressbook
                 $count++;
             }
             else {
-                raise_error(array(
+                rcube::raise_error(array(
                   'code' => 600, 'type' => 'php',
                   'file' => __FILE__, 'line' => __LINE__,
                   'message' => "Error undeleting a contact object $uid from the Kolab server"),
@@ -731,10 +731,10 @@ class rcube_kolab_contacts extends rcube_addressbook
         $saved = $this->storagefolder->save($list, 'distribution-list');
 
         if (!$saved) {
-            raise_error(array(
-              'code' => 600, 'type' => 'php',
-              'file' => __FILE__, 'line' => __LINE__,
-              'message' => "Error saving distribution-list object to Kolab server"),
+            rcube::raise_error(array(
+                'code' => 600, 'type' => 'php',
+                'file' => __FILE__, 'line' => __LINE__,
+                'message' => "Error saving distribution-list object to Kolab server"),
             true, false);
             return false;
         }
@@ -758,18 +758,20 @@ class rcube_kolab_contacts extends rcube_addressbook
         $this->_fetch_groups();
         $result = false;
 
-        if ($list = $this->distlists[$gid])
+        if ($list = $this->distlists[$gid]) {
             $deleted = $this->storagefolder->delete($list['uid']);
+        }
 
         if (!$deleted) {
-            raise_error(array(
-              'code' => 600, 'type' => 'php',
-              'file' => __FILE__, 'line' => __LINE__,
-              'message' => "Error deleting distribution-list object from the Kolab server"),
+            rcube::raise_error(array(
+                'code' => 600, 'type' => 'php',
+                'file' => __FILE__, 'line' => __LINE__,
+                'message' => "Error deleting distribution-list object from the Kolab server"),
             true, false);
         }
-        else
+        else {
             $result = true;
+        }
 
         return $result;
     }
@@ -792,10 +794,10 @@ class rcube_kolab_contacts extends rcube_addressbook
         }
 
         if (!$saved) {
-            raise_error(array(
-              'code' => 600, 'type' => 'php',
-              'file' => __FILE__, 'line' => __LINE__,
-              'message' => "Error saving distribution-list object to Kolab server"),
+            rcube::raise_error(array(
+                'code' => 600, 'type' => 'php',
+                'file' => __FILE__, 'line' => __LINE__,
+                'message' => "Error saving distribution-list object to Kolab server"),
             true, false);
             return false;
         }
@@ -857,10 +859,10 @@ class rcube_kolab_contacts extends rcube_addressbook
             $saved = true;
 
         if (!$saved) {
-            raise_error(array(
-              'code' => 600, 'type' => 'php',
-              'file' => __FILE__, 'line' => __LINE__,
-              'message' => "Error saving distribution-list to Kolab server"),
+            rcube::raise_error(array(
+                'code' => 600, 'type' => 'php',
+                'file' => __FILE__, 'line' => __LINE__,
+                'message' => "Error saving distribution-list to Kolab server"),
             true, false);
             $added = false;
             $this->set_error(self::ERROR_SAVING, 'errorsaving');
@@ -899,10 +901,10 @@ class rcube_kolab_contacts extends rcube_addressbook
         $saved = $this->storagefolder->save($list, 'distribution-list', $list['uid']);
 
         if (!$saved) {
-            raise_error(array(
-              'code' => 600, 'type' => 'php',
-              'file' => __FILE__, 'line' => __LINE__,
-              'message' => "Error saving distribution-list object to Kolab server"),
+            rcube::raise_error(array(
+                'code' => 600, 'type' => 'php',
+                'file' => __FILE__, 'line' => __LINE__,
+                'message' => "Error saving distribution-list object to Kolab server"),
             true, false);
         }
         else {
diff --git a/plugins/libkolab/libkolab.php b/plugins/libkolab/libkolab.php
index 3709ee04..887d3082 100644
--- a/plugins/libkolab/libkolab.php
+++ b/plugins/libkolab/libkolab.php
@@ -46,7 +46,7 @@ class libkolab extends rcube_plugin
             kolab_format::$timezone = new DateTimeZone($rcmail->config->get('timezone', 'GMT'));
         }
         catch (Exception $e) {
-            raise_error($e, true);
+            rcube::raise_error($e, true);
             kolab_format::$timezone = new DateTimeZone('GMT');
         }