diff --git a/app/src/Middlewares/WhoopsMiddleware.php b/app/src/Middlewares/WhoopsMiddleware.php
index d8cee5c..d90d0be 100644
--- a/app/src/Middlewares/WhoopsMiddleware.php
+++ b/app/src/Middlewares/WhoopsMiddleware.php
@@ -40,7 +40,7 @@ class WhoopsMiddleware
 
         $this->whoops->pushHandler($this->pageHandler);
 
-        if (in_array('application/json', explode(',', $request->getHeaderLine('Accept')))) {
+        if (in_array('application/json', explode(',', (string) $request->getHeaderLine('Accept')))) {
             $this->whoops->pushHandler($this->jsonHandler);
         }