fix #403

src/Controllers/LogController.php

@@ -45,9 +45,15 @@ class LogController extends Controller
 
             $grid->input->responsive()->display(function ($input) {
                 $input = json_decode($input, true);
+
+                if (empty($input)) {
+                    return;
+                }
+
                 $input = Arr::except($input, ['_pjax', '_token', '_method', '_previous_']);
+
                 if (empty($input)) {
-                    return '';
+                    return;
                 }
 
                 return '<pre class="dump">'.json_encode($input, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE).'</pre>';