src/QUI/ERP/Accounting/ArticleListUnique.php

@@ -418,21 +418,23 @@ public function toHTML(
         }
 
         // price display
-        foreach ($vatArray as $key => $vat) {
-            $vatArray[$key]['sum'] = $Currency->format($vat['sum']);
-        }
+        if (is_numeric($this->calculations['sum'])) {
+            foreach ($vatArray as $key => $vat) {
+                $vatArray[$key]['sum'] = $Currency->format($vat['sum']);
+            }
 
-        $this->calculations['sum'] = $Currency->format($this->calculations['sum']);
-        $this->calculations['subSum'] = $Currency->format($this->calculations['subSum']);
+            $this->calculations['sum'] = $Currency->format($this->calculations['sum']);
+            $this->calculations['subSum'] = $Currency->format($this->calculations['subSum']);
 
-        // Fallback for older unique article lists
-        if (!isset($this->calculations['grandSubSum'])) {
-            $this->calculations['grandSubSum'] = $this->calculations['sum'];
-        }
+            // Fallback for older unique article lists
+            if (!isset($this->calculations['grandSubSum'])) {
+                $this->calculations['grandSubSum'] = $this->calculations['sum'];
+            }
 
-        $this->calculations['grandSubSum'] = $Currency->format($this->calculations['grandSubSum']);
-        $this->calculations['nettoSum'] = $Currency->format($this->calculations['nettoSum']);
-        $this->calculations['nettoSubSum'] = $Currency->format($this->calculations['nettoSubSum']);
+            $this->calculations['grandSubSum'] = $Currency->format($this->calculations['grandSubSum']);
+            $this->calculations['nettoSum'] = $Currency->format($this->calculations['nettoSum']);
+            $this->calculations['nettoSubSum'] = $Currency->format($this->calculations['nettoSubSum']);
+        }
 
         $articles = [];