Adding rule in Filtering log cause errors

[monsieurtarlan]

Please answer the following questions for yourself before submitting an issue

• Filters were updated before reproducing an issue
• I checked the knowledge base and found no answer
• I checked to make sure that this issue has not already been filed

AdGuard version

8 nightly 44

Browser version

Any

OS version

Windows 11. 25H2

Traffic filtering

• yes, I do

Ad Blocking

No response

Privacy

No response

Social

No response

Annoyances

No response

Security

No response

Other

No response

Language-specific

No response

Which DNS server do you use?

AdGuard DNS Non-filtering

DNS protocol

None

Custom DNS

No response

What Stealth Mode options do you have enabled?

No response

Support ticket ID

No response

Issue Details

Steps to reproduce:

1. Try to add a rule for this soure URL- https://use.typekit.net/hca4fbg.css

Expected Behavior

No response

Actual Behavior

1. As you can see in the video, I get this error when I add a rule:
   Sequence contained null element. Parameter name: values

2. And the user rule is added with empty fields

3. And I can't delete them

Screenshots

bandicam.2026-04-23.17-50-11-268.mp4

Additional Information

Sending the logs

[KolbasovAnton]

@monsieurtarlan Greetings. Was this website chosen merely as an example and this behavior recur with any rule in Filtering log?

[monsieurtarlan]

@monsieurtarlan Greetings. Was this website chosen merely as an example and this behavior recur with any rule in Filtering log?

Yes, you can take a look at 00:52 when trying to add a rule googletagmanagers.com this issue ALSO happened