[Administration] Statistiques : problème calcul statistiques

Statistic/Statistic.php

     public function setData(string $propertyName, string $key, $value)
     {
         if (isset($this->properties[$propertyName])) {
-            $this->properties[$propertyName]['data'][$key] += $value;
+            if(isset($this->properties[$propertyName]['data'][$key])) {
+                $this->properties[$propertyName]['data'][$key] += $value;
+            }
             $this->properties[$propertyName]['total_period'] += $value;
         } else {
             throw new \Exception('La proprieté "' . $propertyName . '" n\'existe pas ');