diff --git a/package/contents/ui/main.qml b/package/contents/ui/main.qml
index 75ae04d..3c362f1 100644
--- a/package/contents/ui/main.qml
+++ b/package/contents/ui/main.qml
@@ -55,8 +55,8 @@ Item {
     property double iconBottomMargin: itemHeight * plasmoid.configuration.iconBottomMargin * 0.01
     property bool enableLabelDropShadow: plasmoid.configuration.enableLabelDropShadow
 
-    property var systemmonitorAvailableSources
-    property var systemmonitorSourcesToAdd
+    property var systemmonitorAvailableSources: []
+    property var systemmonitorSourcesToAdd: []
 
     property int numberOfParts: temperatureModel.count
 
@@ -171,13 +171,6 @@ Item {
         reloadAllSources()
     }
 
-    function getSystemmonitorAvailableSources() {
-        if (!systemmonitorAvailableSources) {
-            systemmonitorAvailableSources = systemmonitorDS.sources
-        }
-        return systemmonitorAvailableSources
-    }
-
     function action_reloadSources() {
         reloadAllSources()
     }
@@ -194,10 +187,6 @@ Item {
             systemmonitorAvailableSources = []
         }
 
-        if (!systemmonitorSourcesToAdd) {
-            systemmonitorSourcesToAdd = []
-        }
-
         if (systemmonitorDS.connectedSources === undefined) {
             systemmonitorDS.connectedSources = []
         }
@@ -281,10 +270,12 @@ Item {
 
             dbgprint('adding source to systemmonitorDS: ' + source)
 
-            if (getSystemmonitorAvailableSources().indexOf(source) > -1) {
+            if (systemmonitorDS.sources.indexOf(source) > -1) {
+                // this is an existing source of systemmonitorDS so we can connect it
                 dbgprint('adding to connected')
                 addToSourcesOfDatasource(systemmonitorDS, source)
             } else {
+                // the source does not exist in systemmonitorDS (yet...) so we can't add yet it but we store it to add it if it appears later
                 dbgprint('adding to sta')
                 systemmonitorSourcesToAdd.push(source)
             }
@@ -313,7 +304,6 @@ Item {
 
             if (source.indexOf(lmSensorsStart) === 0 || source.indexOf(acpiStart) === 0) {
 
-                systemmonitorAvailableSources.push(source)
                 var staIndex = systemmonitorSourcesToAdd.indexOf(source)
                 if (staIndex > -1) {
                     addToSourcesOfDatasource(systemmonitorDS, source)