diff --git a/tine20/Addressbook/Controller/Contact.php b/tine20/Addressbook/Controller/Contact.php
index 3cd8be13f7..9348d6ee9e 100644
--- a/tine20/Addressbook/Controller/Contact.php
+++ b/tine20/Addressbook/Controller/Contact.php
@@ -1367,9 +1367,13 @@ public function inspectUpdateUser(Tinebase_Model_FullUser $_updatedUser, Tinebas
             }
         }
 
-        $diff = $contact->diff($oldContact, $syncPhoto ? array('n_fn') : array('jpegphoto', 'n_fn'));
+        $omitFields = ['n_fn', 'n_fileas'];
+        if (! $syncPhoto) {
+            $omitFields[] = 'jpegphoto';
+        }
+        /** @var Tinebase_Model_Diff $diff */
+        $diff = $contact->diff($oldContact, $omitFields);
         if (! $diff->isEmpty() || ($oldContact->jpegphoto === 0 && !empty($contact->jpegphoto))) {
-
             $oldContext = $this->_requestContext;
             if (!is_array($this->_requestContext)) {
                 $this->_requestContext = array();
@@ -1378,10 +1382,17 @@ public function inspectUpdateUser(Tinebase_Model_FullUser $_updatedUser, Tinebas
                 $this->_requestContext[self::CONTEXT_NO_ACCOUNT_UPDATE] = true;
             }
 
+            if (Tinebase_Core::isLogLevel(Zend_Log::DEBUG)) {
+                Tinebase_Core::getLogger()->debug(
+                    __METHOD__ . '::' . __LINE__ . " Diff " . print_r($diff->toArray(), true));
+            }
+
             $this->update($contact, false);
 
-            if (Tinebase_Core::isLogLevel(Zend_Log::DEBUG)) Tinebase_Core::getLogger()->debug(__METHOD__ . '::' . __LINE__
-                . " updated contact " . $contact->n_given);
+            if (Tinebase_Core::isLogLevel(Zend_Log::INFO)) {
+                Tinebase_Core::getLogger()->info(
+                    __METHOD__ . '::' . __LINE__ . " Updated contact " . $contact->n_fn);
+            }
 
             $this->_requestContext = $oldContext;
         }
diff --git a/tine20/Tinebase/User.php b/tine20/Tinebase/User.php
index 89f713bbc4..518693ba54 100644
--- a/tine20/Tinebase/User.php
+++ b/tine20/Tinebase/User.php
@@ -649,17 +649,19 @@ protected static function _syncDataAndUpdateUser($user, $options)
         $currentUser = self::_getLdapUserController()->getUserByProperty('accountId', $user, 'Tinebase_Model_FullUser', true);
 
         if (self::_checkAndUpdateCurrentUser($currentUser, $user, $options)) {
-            if (Tinebase_Core::isLogLevel(Zend_Log::DEBUG)) Tinebase_Core::getLogger()->debug(__METHOD__ . '::' . __LINE__
-                . ' Record needs an update');
+            if (Tinebase_Core::isLogLevel(Zend_Log::DEBUG)) {
+                Tinebase_Core::getLogger()->debug(__METHOD__ . '::' . __LINE__
+                    . ' Record needs an update');
+            }
             Tinebase_Timemachine_ModificationLog::setRecordMetaData($currentUser, 'update');
             $syncedUser = self::_getLdapUserController()->updateUserInSqlBackend($currentUser);
         } else {
             $syncedUser = $currentUser;
         }
+
         if (! empty($user->container_id)) {
             $syncedUser->container_id = $user->container_id;
         }
-
         // Addressbook is registered as plugin and will take care of the update
         self::_getLdapUserController()->updatePluginUser($syncedUser, $user);
 
@@ -719,9 +721,13 @@ protected static function _checkAndUpdateCurrentUser(Tinebase_Model_FullUser $cu
                 continue;
             }
             // SYNC NON-EMPTY OPTIONAL or REQUIRED fields
-            else if ($currentUser->{$field} !== $user->{$field}) {
-                if (Tinebase_Core::isLogLevel(Zend_Log::DEBUG)) Tinebase_Core::getLogger()->debug(__METHOD__ . '::' . __LINE__
+            else if ($currentUser->{$field} !== $user->{$field}
+                && (! empty($currentUser->{$field}) || ! empty($user->{$field})))
+            {
+                if (Tinebase_Core::isLogLevel(Zend_Log::DEBUG)) {
+                    Tinebase_Core::getLogger()->debug(__METHOD__ . '::' . __LINE__
                     . ' Diff found in field ' . $field  . ' current: ' . $currentUser->{$field} . ' new: ' . $user->{$field});
+                }
                 $currentUser->{$field} = $user->{$field};
                 $recordNeedsUpdate = true;
             }