ob_end_clean(): failed to delete buffer. No buffer to delete

[mouyong]

Make sure you read Issues Guideline and answer these questions before submitting your issue. Thanks!
(Any non-English issues will be closed immediately.)

1. Please provide your PHP and Swoole version. (php -v and php --ri swoole)

PHP 7.4.16 (cli) (built: Apr 10 2021 13:37:36) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
    with Zend OPcache v7.4.16, Copyright (c), by Zend Technologies

swoole

Swoole => enabled
Author => Swoole Team <team@swoole.com>
Version => 4.6.7
Built => May 27 2021 10:31:11
coroutine => enabled with boost asm context
epoll => enabled
eventfd => enabled
signalfd => enabled
cpu_affinity => enabled
spinlock => enabled
rwlock => enabled
zlib => 1.2.11
mutex_timedlock => enabled
pthread_barrier => enabled
futex => enabled
async_redis => enabled

Directive => Local Value => Master Value
swoole.enable_coroutine => On => On
swoole.enable_library => On => On
swoole.enable_preemptive_scheduler => Off => Off
swoole.display_errors => On => On
swoole.use_shortname => On => On
swoole.unixsock_buffer_size => 8388608 => 8388608

2. Please provide your Laravel/Lumen version.

Laravel Framework 8.45.1

3. Which release version of this package are you using?

+-----------------+--------------------------------------------+
| Name            | Value                                      |
+-----------------+--------------------------------------------+
| PHP Version     | 7.4.16                                     |
| Swoole Version  | 4.6.7                                      |
| Laravel Version | 8.45.1                                     |
| Listen IP       | 0.0.0.0                                    |
| Listen Port     | 80                                         |
| Server Status   | Online                                     |
| Reactor Num     | 1                                          |
| Worker Num      | 1                                          |
| Task Worker Num | 0                                          |
| Websocket Mode  | Off                                        |
| Master PID      | 102                                        |
| Manager PID     | 109                                        |
| Log Path        | /var/www/html/storage/logs/swoole_http.log |
+-----------------+--------------------------------------------+

4. What did you do? If possible, provide a recipe for reproducing the error.
   when i use dcat-admin in laravel-swoole，and export some data，it said this error.

5. What did you expect to see?
   i want export xlsx file.

6. What did you see instead?

[mouyong]

[Arkanius]

It looks wierd to me. Doesn't look like swoole problem imo.

Are you using nginx or other web server or just swoole?