XenForo help with error: Argument #1 ($url) must be of type string, null given, called in

[Mr Lucky]

Please can someone tell me what this error means?
Code:

TypeError: XF\Util\Url::urlToUtf8(): Argument #1 ($url) must be of type string, null given, called in /home/caf/public_html/src/XF/BbCode/ProcessorAction/AutoLink.php on line 430 src/XF/Util/Url.php:50
Generated by: Pete Thomas Jul 8, 2023 at 9:43 AM
Stack trace
#0 src/XF/BbCode/ProcessorAction/AutoLink.php(430): XF\Util\Url::urlToUtf8(NULL, false)
#1 src/XF/BbCode/ProcessorAction/AutoLink.php(149)...

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