Error in content-script when $jsinject exception is applied

[AdamWr]

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• [x] Filters were updated before reproducing an issue
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AdGuard version

7.21.0 nightly 12 (4969) (CL 1.17.94, DL 2.5.63 )

Browser version

Chrome 134

OS version

Windows 11

Issue Details

Steps to reproduce:

1. Add this rule to user rules:

@@||example.org^$jsinject

2. Go to - https://example.org/
3. Open browser console

Expected Behavior

There should not be any error.

Actual Behavior

There is an error:

Uncaught TypeError: Cannot read properties of null (reading 'length')

Screenshots

Screenshot 1

Additional Information

No response