diff --git a/umbrello/umlappprivate.cpp b/umbrello/umlappprivate.cpp
index 1e9357a9c..d8bae2cfe 100644
--- a/umbrello/umlappprivate.cpp
+++ b/umbrello/umlappprivate.cpp
@@ -1,171 +1,172 @@
 /***************************************************************************
  *   This program is free software; you can redistribute it and/or modify  *
  *   it under the terms of the GNU General Public License as published by  *
  *   the Free Software Foundation; either version 2 of the License, or     *
  *   (at your option) any later version.                                   *
  *                                                                         *
  *   copyright (C) 2002-2020                                               *
  *   Umbrello UML Modeller Authors <umbrello-devel@kde.org>                *
  ***************************************************************************/
 
 #include "umlappprivate.h"
 
 #include "debug_utils.h"
 
 #include <KFilterDev>
 
 /**
  * Find welcome.html file for displaying in the welcome window.
  *
  * @return path to welcome file or empty if not found
  */
 QString UMLAppPrivate::findWelcomeFile()
 {
     QStringList dirList;
     // from build dir
     dirList.append(QCoreApplication::applicationDirPath() + QLatin1String("/../doc/apphelp"));
 
     // determine path from installation
 #if QT_VERSION > 0x050000
     QString name = QLocale().name();
     QStringList lang = name.split(QLatin1Char('_'));
     QStringList langList;
     langList.append(lang[0]);
     if (lang.size() > 1)
         langList.append(name);
 
     // from custom install
     foreach(const QString &lang, langList) {
         dirList.append(QCoreApplication::applicationDirPath() + QString(QLatin1String("/../share/doc/HTML/%1/umbrello/apphelp")).arg(lang));
     }
     dirList.append(QCoreApplication::applicationDirPath() + QLatin1String("/../share/doc/HTML/en/umbrello/apphelp"));
 
     QStringList locations = QStandardPaths::standardLocations(QStandardPaths::GenericDataLocation);
     // from real installation
     foreach(const QString &location, locations) {
         foreach(const QString &lang, langList) {
             dirList.append(QString(QLatin1String("%1/doc/HTML/%2/umbrello/apphelp")).arg(location).arg(lang));
         }
         dirList.append(QString(QLatin1String("%1/doc/HTML/en/umbrello/apphelp")).arg(location));
     }
 #else
     KLocale *local = KGlobal::locale();
     QString lang = local->language();
     // from custom install
     dirList.append(QCoreApplication::applicationDirPath() + QString(QLatin1String("/../share/doc/HTML/%1/umbrello/apphelp")).arg(lang));
     dirList.append(QCoreApplication::applicationDirPath() + QLatin1String("/../share/doc/HTML/en/umbrello/apphelp"));
 
     // /usr/share/doc/kde
     dirList.append(KStandardDirs::installPath("html") + lang + QLatin1String("/umbrello/apphelp"));
 #endif
     foreach(const QString &dir, dirList) {
         QString filePath = dir + QLatin1String("/index.cache.bz2");
         QFileInfo fi(filePath);
         if (fi.exists()) {
             uDebug() << "searching for" << filePath << "found";
             return filePath;
         } else
             uDebug() << "searching for" << filePath;
     }
     return QString();
 }
 
 /**
  * Read welcome file for displaying in the welcome window.
  *
  * This method also patches out some unrelated stuff from
  * the html file intended or being displayed with khelpcenter.
  *
  * @return html content of welcome file
  */
 QString UMLAppPrivate::readWelcomeFile(const QString &file)
 {
     QString html;
     if (file.endsWith(QLatin1String(".cache.bz2"))) {
         QIODevice *d =  KFilterDev::deviceForFile(file);
         if (!d->open(QIODevice::ReadOnly)) {
             uError() << "could not open archive " << file;
             return QString();
         }
         QByteArray data = d->readAll();
         html = QString::fromUtf8(data);
         d->close();
+        delete d;
     } else {
         QFile f(file);
         if (!f.open(QIODevice::ReadOnly))
             return QString();
         QTextStream in(&f);
         html = in.readAll();
     }
 
     if (html.isEmpty()) {
         uError() << "Empty welcome page loaded" << file;
         return QString();
     }
 
     html.replace(QLatin1String("<FILENAME filename=\"index.html\">"),QLatin1String(""));
     html.replace(QLatin1String("</FILENAME>"),QLatin1String(""));
 //#define WITH_HEADER
 #ifndef WITH_HEADER
     html.replace(QLatin1String("<div id=\"header\""),QLatin1String("<div id=\"header\" hidden"));
     html.replace(QLatin1String("<div class=\"navCenter\""),QLatin1String("<div id=\"navCenter\" hidden"));
 #else
     // replace help:/ urls in html file to be able to find css files and images from kde help system
 #if QT_VERSION >= 0x050000
     QString path;
     QStringList locations = QStandardPaths::standardLocations(QStandardPaths::GenericDataLocation);
     foreach(const QString &l, locations) {
         QString a = QString(QLatin1String("%1/doc/HTML/en/")).arg(l);
         QFileInfo fi(a);
         if (fi.exists()) {
             path = a;
             break;
         }
     }
 #else
     QString path = KStandardDirs::installPath("html") +  QLatin1String("en/");
 #endif
     QUrl url(QUrl::fromLocalFile(path));
     QByteArray a = url.toEncoded();
     html.replace(QLatin1String("help:/"), QString::fromLocal8Bit(a));
 #endif
     return html;
 }
 
 bool UMLAppPrivate::openFileInEditor(const QUrl &file, int startCursor, int endCursor)
 {
     if (editor == nullptr) {
         uError() << "could not get editor instance, which indicates an installation problem, see for kate[4]-parts package";
         return false;
     }
 
     if (file.isLocalFile()) {
         QFileInfo fi(file.toLocalFile());
         if (!fi.exists())
             return false;
     }
 
     if (!editorWindow) {
         editorWindow = new QDockWidget(QLatin1String("Editor"));
         parent->addDockWidget(Qt::RightDockWidgetArea, editorWindow);
     }
 
     if (document) {
         editorWindow->setWidget(0);
         delete view;
         delete document;
     }
     document = editor->createDocument(0);
     view = document->createView(parent);
     view->document()->openUrl(file);
     view->document()->setReadWrite(false);
     if (startCursor != endCursor)
         view->setCursorPosition(KTextEditor::Cursor(startCursor, endCursor));
     KTextEditor::ConfigInterface *iface = qobject_cast<KTextEditor::ConfigInterface*>(view);
     if(iface)
         iface->setConfigValue(QString::fromLatin1("line-numbers"), true);
 
     editorWindow->setWidget(view);
     editorWindow->setVisible(true);
     return true;
 }