[RSS Feed/News] Error when I try to add a link

[XenForo]

What could be the reason for this error when I try to add this link?

Code:

https://kesenek.sgk.gov.tr/KesenekWeb/doc/Aylıksız_İzinli_Sayılan_Kamu_Personeli_GSS_Primleri.pdf

TypeError: Argument 1 passed to XF\Util\Url::urlToUtf8() must be of the type string, null given, called in /home/htsumer/public_html/forum/src/XF/BbCode/ProcessorAction/AutoLink.php on line 430 in src/XF/Util/Url.php at line 50

1. XF\Util\Url::urlToUtf8() in...

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