diff --git a/application/WarehouseArticle/WarehouseArticleController.php b/application/WarehouseArticle/WarehouseArticleController.php
index 0b416255a..3180a1f02 100644
--- a/application/WarehouseArticle/WarehouseArticleController.php
+++ b/application/WarehouseArticle/WarehouseArticleController.php
@@ -76,7 +76,25 @@ class WarehouseArticleController extends TTCrud {
             $prices[] = ['title' => $pt->title, 'price' => round($p, 2)]; // Add title and rounded price
         }
 
-        usort($prices, fn($x,$y)=>(match($x['title']){'Verkauf'=>1,'Partner'=>2,'Energie Steiermark'=>3,default=>4})<=>(match($y['title']){'Verkauf'=>1,'Partner'=>2,'Energie Steiermark'=>3,default=>4}));
+        usort($prices, function($x, $y) {
+            $priorityX = 4;
+            $titleX = isset($x['title']) ? $x['title'] : null;
+            switch ($titleX) {
+                case 'Verkauf': $priorityX = 1; break;
+                case 'Partner': $priorityX = 2; break;
+                case 'Energie Steiermark': $priorityX = 3; break;
+            }
+
+            $priorityY = 4;
+            $titleY = isset($y['title']) ? $y['title'] : null;
+            switch ($titleY) {
+                case 'Verkauf': $priorityY = 1; break;
+                case 'Partner': $priorityY = 2; break;
+                case 'Energie Steiermark': $priorityY = 3; break;
+            }
+
+            return $priorityX <=> $priorityY;
+        });
 
         $a->cheapestSellPrice = json_encode($prices);
         WarehouseArticleModel::update(get_object_vars($a));
@@ -93,4 +111,4 @@ class WarehouseArticleController extends TTCrud {
     protected function getHistoryAction() {
         self::returnJson((new WarehouseHistoryController)->getHistory($this->request->id, $this->mod, $this->columns));
     }
-}
\ No newline at end of file
+}