Update (kernel)

app/Console/Kernel.php

@@ -24,7 +24,12 @@ protected function schedule(Schedule $schedule): void
         $schedule->call(function () {
             $future_post = Post::whereNotNull('published_at')->where('status', 'future')->where('published_at', '>=', now())->orderBy('published_at', 'ASC')->first();
 
+            if (!is_null($future_post))
+            {
               PublishIndexPostJob::dispatch($future_post->id)->onQueue('default')->onConnection('default');
+            }
+
+            
 
         })->everyMinute();