diff --git a/panel/lxqtpanelpluginconfigdialog.cpp b/panel/lxqtpanelpluginconfigdialog.cpp
index 0978f13a6..a92d46c81 100644
--- a/panel/lxqtpanelpluginconfigdialog.cpp
+++ b/panel/lxqtpanelpluginconfigdialog.cpp
@@ -58,6 +58,15 @@ PluginSettings& LXQtPanelPluginConfigDialog::settings() const
 }
 
 
+/************************************************
+
+ ************************************************/
+void LXQtPanelPluginConfigDialog::closeEvent(QCloseEvent *event)
+{
+    mSettings.storeToCache();
+    return QDialog::closeEvent(event);
+}
+
 
 /************************************************
 
diff --git a/panel/lxqtpanelpluginconfigdialog.h b/panel/lxqtpanelpluginconfigdialog.h
index 93bd4e0d5..8fdb14e7b 100644
--- a/panel/lxqtpanelpluginconfigdialog.h
+++ b/panel/lxqtpanelpluginconfigdialog.h
@@ -35,6 +35,7 @@
 #include "pluginsettings.h"
 
 class QComboBox;
+class QCloseEvent;
 
 class LXQT_PANEL_API LXQtPanelPluginConfigDialog : public QDialog
 {
@@ -46,6 +47,9 @@ class LXQT_PANEL_API LXQtPanelPluginConfigDialog : public QDialog
 
     PluginSettings &settings() const;
 
+protected:
+    virtual void closeEvent(QCloseEvent *event) override;
+
 protected slots:
     /*
       Saves settings in conf file.
diff --git a/panel/plugin.cpp b/panel/plugin.cpp
index c4d3c440d..25903a100 100644
--- a/panel/plugin.cpp
+++ b/panel/plugin.cpp
@@ -188,6 +188,8 @@ Plugin::Plugin(const LXQt::PluginInfo &desktopFile, LXQt::Settings *settings, co
  ************************************************/
 Plugin::~Plugin()
 {
+    if (mConfigDialog)
+        delete mConfigDialog.data();
     delete mPlugin;
     delete mPluginLoader;
     delete mSettings;
@@ -515,7 +517,6 @@ void Plugin::showConfigureDialog()
     if (!mConfigDialog)
         return;
 
-    connect(this, &Plugin::destroyed, mConfigDialog.data(), &QWidget::close);
     mPanel->willShowWindow(mConfigDialog);
     mConfigDialog->show();
     mConfigDialog->raise();
diff --git a/panel/pluginsettings.cpp b/panel/pluginsettings.cpp
index d5a2be958..3f6c86459 100644
--- a/panel/pluginsettings.cpp
+++ b/panel/pluginsettings.cpp
@@ -28,15 +28,18 @@
 #include "pluginsettings.h"
 #include "pluginsettings_p.h"
 #include <LXQt/Settings>
+#include <memory>
 
 class PluginSettingsPrivate
 {
 public:
     PluginSettingsPrivate(LXQt::Settings* settings, const QString &group)
         : mSettings(settings)
-        , mOldSettings(settings)
         , mGroup(group)
     {
+        mSettings->beginGroup(mGroup);
+        mOldSettings = std::make_unique<LXQt::SettingsCache>(mSettings);
+        mSettings->endGroup();
     }
 
     QString prefix() const;
@@ -46,7 +49,7 @@ class PluginSettingsPrivate
     }
 
     LXQt::Settings *mSettings;
-    LXQt::SettingsCache mOldSettings;
+    std::unique_ptr<LXQt::SettingsCache> mOldSettings;
     QString mGroup;
     QStringList mSubGroups;
 };
@@ -163,10 +166,8 @@ void PluginSettings::clear()
 void PluginSettings::sync()
 {
     Q_D(PluginSettings);
-    d->mSettings->beginGroup(d->mGroup);
     d->mSettings->sync();
-    d->mOldSettings.loadFromSettings();
-    d->mSettings->endGroup();
+    storeToCache();
     emit settingsChanged();
 }
 
@@ -205,7 +206,17 @@ void PluginSettings::loadFromCache()
 {
     Q_D(PluginSettings);
     d->mSettings->beginGroup(d->mGroup);
-    d->mOldSettings.loadToSettings();
+    d->mSettings->remove(QString{});
+    d->mOldSettings->loadToSettings();
+    d->mSettings->endGroup();
+    emit settingsChanged();
+}
+
+void PluginSettings::storeToCache()
+{
+    Q_D(PluginSettings);
+    d->mSettings->beginGroup(d->mGroup);
+    d->mOldSettings = std::make_unique<LXQt::SettingsCache>(d->mSettings);
     d->mSettings->endGroup();
 }
 
diff --git a/panel/pluginsettings.h b/panel/pluginsettings.h
index 19e5f5f7b..d9b01d554 100644
--- a/panel/pluginsettings.h
+++ b/panel/pluginsettings.h
@@ -81,6 +81,7 @@ class LXQT_PANEL_API PluginSettings : public QObject
     void endGroup();
 
     void loadFromCache();
+    void storeToCache();
 
 signals:
     void settingsChanged();
diff --git a/plugin-taskbar/lxqttaskbar.cpp b/plugin-taskbar/lxqttaskbar.cpp
index aa4abe580..e6e4866ae 100644
--- a/plugin-taskbar/lxqttaskbar.cpp
+++ b/plugin-taskbar/lxqttaskbar.cpp
@@ -485,10 +485,10 @@ void LXQtTaskBar::settingsChanged()
     else
         setButtonStyle(Qt::ToolButtonTextBesideIcon);
 
-    mShowOnlyOneDesktopTasks = mPlugin->settings()->value(QStringLiteral("showOnlyOneDesktopTasks"), mShowOnlyOneDesktopTasks).toBool();
-    mShowDesktopNum = mPlugin->settings()->value(QStringLiteral("showDesktopNum"), mShowDesktopNum).toInt();
-    mShowOnlyCurrentScreenTasks = mPlugin->settings()->value(QStringLiteral("showOnlyCurrentScreenTasks"), mShowOnlyCurrentScreenTasks).toBool();
-    mShowOnlyMinimizedTasks = mPlugin->settings()->value(QStringLiteral("showOnlyMinimizedTasks"), mShowOnlyMinimizedTasks).toBool();
+    mShowOnlyOneDesktopTasks = mPlugin->settings()->value(QStringLiteral("showOnlyOneDesktopTasks"), false).toBool();
+    mShowDesktopNum = mPlugin->settings()->value(QStringLiteral("showDesktopNum"), 0).toInt();
+    mShowOnlyCurrentScreenTasks = mPlugin->settings()->value(QStringLiteral("showOnlyCurrentScreenTasks"), false).toBool();
+    mShowOnlyMinimizedTasks = mPlugin->settings()->value(QStringLiteral("showOnlyMinimizedTasks"), false).toBool();
     mAutoRotate = mPlugin->settings()->value(QStringLiteral("autoRotate"), true).toBool();
     mCloseOnMiddleClick = mPlugin->settings()->value(QStringLiteral("closeOnMiddleClick"), true).toBool();
     mRaiseOnCurrentDesktop = mPlugin->settings()->value(QStringLiteral("raiseOnCurrentDesktop"), false).toBool();