diff --git a/plugins/calendar/calendar_base.js b/plugins/calendar/calendar_base.js
index 41ae8e59..fa9aa5e2 100644
--- a/plugins/calendar/calendar_base.js
+++ b/plugins/calendar/calendar_base.js
@@ -34,7 +34,6 @@ function rcube_calendar(settings)
     rcube_libcalendaring.call(this, settings);
 
     // member vars
-    this.ui;
     this.ui_loaded = false;
     this.selected_attachment = null;
 
@@ -91,7 +90,7 @@ function rcube_calendar(settings)
         rcmail.http_post('calendar/mailimportattach', {
             _uid: rcmail.env.uid,
             _mbox: rcmail.env.mailbox,
-            _part: this.selected_attachment,
+            _part: this.selected_attachment
             // _calendar: $('#calendar-attachment-saveto').val(),
           }, rcmail.set_busy(true, 'itip.savingdata'));
       }
diff --git a/plugins/calendar/calendar_ui.js b/plugins/calendar/calendar_ui.js
index 84c5adbf..bb7279d7 100644
--- a/plugins/calendar/calendar_ui.js
+++ b/plugins/calendar/calendar_ui.js
@@ -197,18 +197,18 @@ function rcube_calendar_ui(settings)
     {
       var result = [],
         strlen = str.length,
-        q, p, i, char, last;
+        q, p, i, chr, last;
 
       for (q = p = i = 0; i < strlen; i++) {
-        char = str.charAt(i);
-        if (char == '"' && last != '\\') {
+        chr = str.charAt(i);
+        if (chr == '"' && last != '\\') {
           q = !q;
         }
-        else if (!q && char == delimiter) {
+        else if (!q && chr == delimiter) {
           result.push(str.substring(p, i));
           p = i + 1;
         }
-        last = char;
+        last = chr;
       }
 
       result.push(str.substr(p));
diff --git a/plugins/kolab_notes/notes.js b/plugins/kolab_notes/notes.js
index d7e83efc..8256af4d 100644
--- a/plugins/kolab_notes/notes.js
+++ b/plugins/kolab_notes/notes.js
@@ -44,8 +44,8 @@ function rcube_kolab_notes_ui(settings)
     var me = this;
 
     /*  public members  */
-    this.selected_list;
-    this.selected_note;
+    this.selected_list = null;
+    this.selected_note = null;
     this.notebooks = rcmail.env.kolab_notebooks || {};
 
     /**
@@ -571,7 +571,7 @@ function rcube_kolab_notes_ui(settings)
             },
             buttons: buttons,
             minWidth: 480,
-            width: 640,
+            width: 640
         }).show();
 
     }
@@ -1112,7 +1112,7 @@ function rcube_kolab_notes_ui(settings)
             width: model.width(),
             height: model.height(),
             minWidth: 450,
-            minHeight: 400,
+            minHeight: 400
         })
         .show();
 
diff --git a/plugins/tasklist/tasklist.js b/plugins/tasklist/tasklist.js
index 62150bca..110948d2 100644
--- a/plugins/tasklist/tasklist.js
+++ b/plugins/tasklist/tasklist.js
@@ -3175,18 +3175,18 @@ function rcube_tasklist_ui(settings)
     {
       var result = [],
         strlen = str.length,
-        q, p, i, char, last;
+        q, p, i, chr, last;
 
       for (q = p = i = 0; i < strlen; i++) {
-        char = str.charAt(i);
-        if (char == '"' && last != '\\') {
+        chr = str.charAt(i);
+        if (chr == '"' && last != '\\') {
           q = !q;
         }
-        else if (!q && char == delimiter) {
+        else if (!q && chr == delimiter) {
           result.push(str.substring(p, i));
           p = i + 1;
         }
-        last = char;
+        last = chr;
       }
 
       result.push(str.substr(p));
diff --git a/plugins/tasklist/tasklist_base.js b/plugins/tasklist/tasklist_base.js
index 05ea2182..2deb2d4e 100644
--- a/plugins/tasklist/tasklist_base.js
+++ b/plugins/tasklist/tasklist_base.js
@@ -33,7 +33,7 @@ function rcube_tasklist(settings)
     var mywin = window;
 
     /*  public members  */
-    this.ui;
+    this.ui = null;
 
     /* public methods */
     this.create_from_mail = create_from_mail;
@@ -101,7 +101,7 @@ function rcube_tasklist(settings)
         rcmail.http_post('tasks/mailimportattach', {
             _uid: rcmail.env.uid,
             _mbox: rcmail.env.mailbox,
-            _part: this.selected_attachment,
+            _part: this.selected_attachment
             // _list: $('#tasklist-attachment-saveto').val(),
           }, rcmail.set_busy(true, 'itip.savingdata'));
       }