diff --git a/PV_Visu/module.php b/PV_Visu/module.php
index 86060be..502543c 100644
--- a/PV_Visu/module.php
+++ b/PV_Visu/module.php
@@ -16,7 +16,7 @@ class PV_Visu extends IPSModule
         $this->SetVisualizationType(3);
     }
 
-    public function ApplyChanges(): void
+    public function ApplyChanges()
     {
         parent::ApplyChanges();
         $this->UpdateData(); 
@@ -25,7 +25,7 @@ class PV_Visu extends IPSModule
     /**
      * Liefert das HTML-Template und injiziert initiale Tagesdaten
      */
-    public function GetVisualizationTile(): string
+    public function GetVisualizationTile()
     {
         // Tageswerte berechnen
         $start = strtotime('today 00:00');
@@ -77,7 +77,7 @@ class PV_Visu extends IPSModule
     /**
      * Callback vom HTML: sendet frische Daten
      */
-    public function RequestAction($Ident, $Value): void
+    public function RequestAction($Ident, $Value)
     {
         if ($Ident === 'update') {
             $this->UpdateData();
@@ -89,7 +89,7 @@ class PV_Visu extends IPSModule
     /**
      * Aktualisiert Daten und sendet an Tile
      */
-    public function UpdateData(): void
+    public function UpdateData()
     {
         $start = strtotime('today 00:00');
         $end   = time();
@@ -123,7 +123,7 @@ class PV_Visu extends IPSModule
     /**
      * Holt Tages-Aggregat aus dem IPS-Archiv
      */
-    private function GetDailyTotal(int $varID, int $start, int $end): float
+    private function GetDailyTotal(int $varID, int $start, int $end)
     {
         if ($varID <= 0) {
             return 0.0;