Update Model.php

src/Grid/Model.php

@@ -535,7 +535,7 @@ class Model
             return;
         }
 
-        $perPage =  $this->request->get($this->getPerPageName()) ?: $this->perPage;
+        $perPage = $this->request->get($this->getPerPageName()) ?: $this->perPage;
         if ($perPage) {
             return (int) $perPage;
         }