XF 2.3 Import error: (Argument #1 ($ip) must not contain any null bytes)

[lustbb]

What do I have to do to fix this?
I am using cloudflare and PHP version 8.4.16

ValueError: inet_pton(): Argument #1 ($ip) must not contain any null bytes in src/XF/Util/Ip.php at line 14 inet_pton() in src/XF/Util/Ip.php at line 14 XF\Util\Ip::stringToBinary() in src/XF/Import/Data/AbstractData.php at line 278 XF\Import\Data\AbstractData->importRawIp() in src/XF/Import/Data/User.php at line 347 XF\Import\Data\User->postSave() in src/XF/Import/Data/AbstractData.php at line 141 XF\Import\Data\AbstractData->save() in src/XF/Import/Helper.php at line 129 XF\Import\Helper->importUser() in src/XF/Import/Importer/AbstractCoreImporter.php at line 113 XF\Import\Importer\AbstractCoreImporter->importUser() in src/addons/XFI/Import/Importer/MyBb.php at line 538 XFI\Import\Importer\MyBb->stepUsers() in src/XF/Import/Runner.php at line 246 XF\Import\Runner->runStep() in src/XF/Import/Runner.php at line 61 XF\Import\Runner->run() in src/XF/Admin/Controller/ImportController.php at line 247 XF\Admin\Controller\ImportController->actionRun() in src/XF/Mvc/Dispatcher.php at line 362 XF\Mvc\Dispatcher->dispatchClass() in src/XF/Mvc/Dispatcher.php at line 264 XF\Mvc\Dispatcher->dispatchFromMatch() in src/XF/Mvc/Dispatcher.php at line 121 XF\Mvc\Dispatcher->dispatchLoop() in src/XF/Mvc/Dispatcher.php at line 63 XF\Mvc\Dispatcher->run() in src/XF/App.php at line 2824 XF\App->run() in src/XF.php at line 814 XF::runApp() in admin.php at line 15

 

[M@rc]

Thread 'inet_pton(): Argument #1 ($ip) must not contain any null bytes src/XF/Util/Ip.php:14'

Jan 16, 2026

Server Info:
PHP 8.3.29
10.6.24-MariaDB

Tested on my test forum with no addons.

Steps to reproduce:

1. Enable Writing before registering.
2. From a logged out account, write a reply and hit Post Reply.
3. Click the Login button.

The screen will return the error:

A server error occurred. Please try again later.

The server error log will have:

ValueError: inet_pton(): Argument #1 ($ip) must not contain any null bytes src/XF/Util/Ip.php:14
Generated by: Unknown account Jan 16, 2026 at 9:58 PM

Stack trace
#0...

• M@rc
• Replies: 22
• Forum: Bug reports

Try applying this patch:

Post in thread 'inet_pton(): Argument #1 ($ip) must not contain any null bytes src/XF/Util/Ip.php:14'

Feb 14, 2026

change this whole bit starting on line 12

Basically from public static function stringToBinary until the closing }. The code you posted would be too much as it contains the binaryToString function as well.

Basically this bit:


To make it easier feel free to just replace the file with the one I attached here. No other changes have been made.

• SeToY

 

[lustbb]

I figured out a way. I have added ip 127.0.0.1.

user and post and it's working