diff --git a/plugins/kolab_addressbook/kolab_addressbook.js b/plugins/kolab_addressbook/kolab_addressbook.js
index 314bc1e0..a73a6de9 100644
--- a/plugins/kolab_addressbook/kolab_addressbook.js
+++ b/plugins/kolab_addressbook/kolab_addressbook.js
@@ -430,7 +430,7 @@ rcube_webmail.prototype.contact_render_changelog = function(data)
     var $dialog = $('#contacthistory'),
         rec = $dialog.data('rec');
 
-    if (data === false || !data.length || !event) {
+    if (data === false || !data.length || !rec) {
       // display 'unavailable' message
       $('<div class="notfound-message note-dialog-message warning">' + rcmail.gettext('objectchangelognotavailable','kolab_addressbook') + '</div>')
           .insertBefore($dialog.find('.changelog-table').hide());
diff --git a/plugins/kolab_notes/notes.js b/plugins/kolab_notes/notes.js
index d9ff56ec..d7e83efc 100644
--- a/plugins/kolab_notes/notes.js
+++ b/plugins/kolab_notes/notes.js
@@ -1064,7 +1064,7 @@ function rcube_kolab_notes_ui(settings)
         var $dialog = $('#notehistory'),
             rec = $dialog.data('rec');
 
-        if (data === false || !data.length || !event) {
+        if (data === false || !data.length || !rec) {
           // display 'unavailable' message
           $('<div class="notfound-message note-dialog-message warning">' + rcmail.gettext('objectchangelognotavailable','kolab_notes') + '</div>')
               .insertBefore($dialog.find('.changelog-table').hide());
diff --git a/plugins/libkolab/js/audittrail.js b/plugins/libkolab/js/audittrail.js
index 3b389fff..84fdf61b 100644
--- a/plugins/libkolab/js/audittrail.js
+++ b/plugins/libkolab/js/audittrail.js
@@ -253,7 +253,7 @@ window.rcmail && rcmail.addEventListener('init', function(e) {
             var $dialog = $('#mailmessagehistory'),
                 rec = $dialog.data('rec');
 
-            if (data === false || !data.length || !event) {
+            if (data === false || !data.length || !rec) {
               // display 'unavailable' message
               $('<div class="notfound-message dialog-message warning">' + rcmail.gettext('objectchangelognotavailable','libkolab') + '</div>')
                   .insertBefore($dialog.find('.changelog-table').hide());
diff --git a/plugins/tasklist/tasklist.js b/plugins/tasklist/tasklist.js
index 42f6707a..5e343334 100644
--- a/plugins/tasklist/tasklist.js
+++ b/plugins/tasklist/tasklist.js
@@ -2128,7 +2128,7 @@ function rcube_tasklist_ui(settings)
         var $dialog = $('#taskhistory'),
             rec = $dialog.data('rec');
 
-        if (data === false || !data.length || !event) {
+        if (data === false || !data.length || !rec) {
           // display 'unavailable' message
           $('<div class="notfound-message task-dialog-message warning">' + rcmail.gettext('objectchangelognotavailable','tasklist') + '</div>')
             .insertBefore($dialog.find('.changelog-table').hide());