4.0.x

Sets a default NULL value for $logo

src/Response/QRImageResponse.php

@@ -126,6 +126,7 @@ class QRImageResponse extends Response {
     $qrCode->setForegroundColor(new Color(0, 0, 0));
     $qrCode->setBackgroundColor(new Color(255, 255, 255));
 
+    $logo = NULL;
     if ($this->file) {
       // Create generic logo.
       $logo = Logo::create($this->file)