diff --git a/src/Engine.php b/src/Engine.php
index b9cfe1f..aded7e5 100644
--- a/src/Engine.php
+++ b/src/Engine.php
@@ -224,6 +224,17 @@ class Engine
 
         $this->price = 0;
 
+        $tmp = [];
+        foreach ($this->variables as $key => $variable) {
+            if(!is_array($variable)) {
+                $tmp[$key] = str_replace(",", ".", $variable);
+            }else{
+                $tmp[$key] = $variable;
+            }
+        }
+
+        $this->variables = $tmp;
+
         $this->article = $this->getArticleByName($this->activeArticle);
 
         if($this->article === null) {