default to null

Author: taylorotwell

src/Illuminate/Queue/Connectors/RedisConnector.php

@@ -46,7 +46,7 @@ public function connect(array $config)
             $this->redis, $config['queue'],
             $config['connection'] ?? $this->connection,
             $config['retry_after'] ?? 60,
-            $config['block_for'] ?? 0
+            $config['block_for'] ?? null
         );
     }
 }