diff --git a/engine/Shopware/Models/ProductFeed/ProductFeed.php b/engine/Shopware/Models/ProductFeed/ProductFeed.php
index d9a1fa288e3..55ca632cad3 100644
--- a/engine/Shopware/Models/ProductFeed/ProductFeed.php
+++ b/engine/Shopware/Models/ProductFeed/ProductFeed.php
@@ -1143,7 +1143,7 @@ public function sanitizeFilename()
         $this->fileName = basename($this->fileName);
         $extension = strtolower(pathinfo($this->fileName, PATHINFO_EXTENSION));
 
-        if (in_array($extension, \Shopware_Controllers_Backend_MediaManager::$fileUploadBlacklist, true)) {
+        if (!empty($extension) && in_array($extension, \Shopware_Controllers_Backend_MediaManager::$fileUploadBlacklist, true)) {
             $this->fileName = str_replace('.' . $extension, '.invalid', strtolower($this->fileName));
 
             // To prevent PrePersist event