diff --git a/plugins/lunchmealplugin/lunchmealsettingswidget.cpp b/plugins/lunchmealplugin/lunchmealsettingswidget.cpp
index a1edbb2..6f5754b 100644
--- a/plugins/lunchmealplugin/lunchmealsettingswidget.cpp
+++ b/plugins/lunchmealplugin/lunchmealsettingswidget.cpp
@@ -29,8 +29,8 @@ bool LunchMealSettingsWidget::isValid(QString &message) const
     return valid;
 }
 
-void LunchMealSettingsWidget::apply()
+bool LunchMealSettingsWidget::apply()
 {
-    m_settings.setUrl(m_lineEditUrl->text());
-    m_settings.setDateFormat(m_lineEditDateFormat->text());
+    return m_settings.setUrl(m_lineEditUrl->text()) &&
+           m_settings.setDateFormat(m_lineEditDateFormat->text());
 }
diff --git a/plugins/lunchmealplugin/lunchmealsettingswidget.h b/plugins/lunchmealplugin/lunchmealsettingswidget.h
index 72d99d6..779125d 100644
--- a/plugins/lunchmealplugin/lunchmealsettingswidget.h
+++ b/plugins/lunchmealplugin/lunchmealsettingswidget.h
@@ -16,7 +16,7 @@ public:
     virtual bool isValid(QString &message) const Q_DECL_OVERRIDE;
 
 public Q_SLOTS:
-    virtual void apply() Q_DECL_OVERRIDE;
+    virtual bool apply() Q_DECL_OVERRIDE;
 
 private:
     LunchMealSettings m_settings;
diff --git a/plugins/presenceplugin/presencesettingswidget.cpp b/plugins/presenceplugin/presencesettingswidget.cpp
index b86c817..51b2733 100644
--- a/plugins/presenceplugin/presencesettingswidget.cpp
+++ b/plugins/presenceplugin/presencesettingswidget.cpp
@@ -18,13 +18,7 @@ PresenceSettingsWidget::PresenceSettingsWidget(ZeiterfassungSettings &settings,
     setLayout(layout);
 }
 
-bool PresenceSettingsWidget::isValid(QString &message) const
+bool PresenceSettingsWidget::apply()
 {
-    Q_UNUSED(message)
-    return true;
-}
-
-void PresenceSettingsWidget::apply()
-{
-    m_settings.setInterval(m_spinBox->value());
+    return m_settings.setInterval(m_spinBox->value());
 }
diff --git a/plugins/presenceplugin/presencesettingswidget.h b/plugins/presenceplugin/presencesettingswidget.h
index 5427b32..c9d649b 100644
--- a/plugins/presenceplugin/presencesettingswidget.h
+++ b/plugins/presenceplugin/presencesettingswidget.h
@@ -13,10 +13,8 @@ class PresenceSettingsWidget : public SettingsWidget
 public:
     explicit PresenceSettingsWidget(ZeiterfassungSettings &settings, QWidget *parent = Q_NULLPTR);
 
-    virtual bool isValid(QString &message) const Q_DECL_OVERRIDE;
-
 public Q_SLOTS:
-    virtual void apply() Q_DECL_OVERRIDE;
+    virtual bool apply() Q_DECL_OVERRIDE;
 
 private:
     PresenceSettings m_settings;
diff --git a/plugins/updaterplugin/updatersettingswidget.cpp b/plugins/updaterplugin/updatersettingswidget.cpp
index 1b0c63b..883bcc1 100644
--- a/plugins/updaterplugin/updatersettingswidget.cpp
+++ b/plugins/updaterplugin/updatersettingswidget.cpp
@@ -26,7 +26,7 @@ bool UpdaterSettingsWidget::isValid(QString &message) const
     return valid;
 }
 
-void UpdaterSettingsWidget::apply()
+bool UpdaterSettingsWidget::apply()
 {
-    m_settings.setUrl(QUrl(m_lineEdit->text()));
+    return m_settings.setUrl(QUrl(m_lineEdit->text()));
 }
diff --git a/plugins/updaterplugin/updatersettingswidget.h b/plugins/updaterplugin/updatersettingswidget.h
index 74a938e..a3568d2 100644
--- a/plugins/updaterplugin/updatersettingswidget.h
+++ b/plugins/updaterplugin/updatersettingswidget.h
@@ -16,7 +16,7 @@ public:
     virtual bool isValid(QString &message) const Q_DECL_OVERRIDE;
 
 public Q_SLOTS:
-    virtual void apply() Q_DECL_OVERRIDE;
+    virtual bool apply() Q_DECL_OVERRIDE;
 
 private:
     UpdaterSettings m_settings;
diff --git a/plugins/weatherplugin/weathersettingswidget.cpp b/plugins/weatherplugin/weathersettingswidget.cpp
index 2e14db6..35f3cb5 100644
--- a/plugins/weatherplugin/weathersettingswidget.cpp
+++ b/plugins/weatherplugin/weathersettingswidget.cpp
@@ -26,7 +26,7 @@ bool WeatherSettingsWidget::isValid(QString &message) const
     return valid;
 }
 
-void WeatherSettingsWidget::apply()
+bool WeatherSettingsWidget::apply()
 {
-    m_settings.setUrl(QUrl::fromUserInput(m_lineEdit->text()));
+    return m_settings.setUrl(QUrl::fromUserInput(m_lineEdit->text()));
 }
diff --git a/plugins/weatherplugin/weathersettingswidget.h b/plugins/weatherplugin/weathersettingswidget.h
index b1688a6..7936f48 100644
--- a/plugins/weatherplugin/weathersettingswidget.h
+++ b/plugins/weatherplugin/weathersettingswidget.h
@@ -20,7 +20,7 @@ public:
     bool isValid(QString &message) const Q_DECL_OVERRIDE;
 
 public Q_SLOTS:
-    void apply() Q_DECL_OVERRIDE;
+    virtual bool apply() Q_DECL_OVERRIDE;
 
 private:
     WeatherSettings m_settings;
diff --git a/plugins/webradioplugin/webradiosettingswidget.cpp b/plugins/webradioplugin/webradiosettingswidget.cpp
index c66eff1..adec37d 100644
--- a/plugins/webradioplugin/webradiosettingswidget.cpp
+++ b/plugins/webradioplugin/webradiosettingswidget.cpp
@@ -31,8 +31,7 @@ bool WebRadioSettingsWidget::isValid(QString &message) const
     return true;
 }
 
-void WebRadioSettingsWidget::apply()
+bool WebRadioSettingsWidget::apply()
 {
-    if(m_urlsWidget->stringList() != m_settings.urls())
-        m_settings.setUrls(m_urlsWidget->stringList());
+    return m_settings.setUrls(m_urlsWidget->stringList());
 }
diff --git a/plugins/webradioplugin/webradiosettingswidget.h b/plugins/webradioplugin/webradiosettingswidget.h
index d1f77dc..d3556ee 100644
--- a/plugins/webradioplugin/webradiosettingswidget.h
+++ b/plugins/webradioplugin/webradiosettingswidget.h
@@ -20,7 +20,7 @@ public:
     bool isValid(QString &message) const Q_DECL_OVERRIDE;
 
 public Q_SLOTS:
-    void apply() Q_DECL_OVERRIDE;
+    virtual bool apply() Q_DECL_OVERRIDE;
 
 private:
     WebRadioSettings m_settings;
diff --git a/zeiterfassungguilib/settingswidget.h b/zeiterfassungguilib/settingswidget.h
index 7b21ff2..65aebee 100644
--- a/zeiterfassungguilib/settingswidget.h
+++ b/zeiterfassungguilib/settingswidget.h
@@ -15,5 +15,5 @@ public:
     virtual bool isValid(QString &message) const { Q_UNUSED(message) return true; }
 
 public Q_SLOTS:
-    virtual void apply() { }
+    virtual bool apply() = 0;
 };