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### Checklist

- [x] This is a bug report.
- [ ] This is a feature request.
- [ ] I understand the difference between *Streamlink* and *Streamlink Twitch GUI*.
- [ ] I tried solving my issue by reading the project's wiki first.
- [ ] I have read the contribution guidelines und used the search function to find already existing threads.

### Description

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### Expected / Actual behavior

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### Reproduction steps

1. ...
2. ...
3. ...

### Environment details

Operating system and version: ...
Streamlink Twitch GUI version: ...
Streamlink version: ...
Configuration details: ...

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### Comments, logs, screenshots, etc.

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*Thanks for reporting an issue!*
*Please read the contribution guidelines first! (see the link above)*

*Feel free to use the following template. Be as detailed as possible.*
*Please see the text preview to avoid unnecessary formatting errors.*
*Don't forget to remove this text before submitting.*

----

### Checklist

- [x] This is a bug report.
- [ ] This is a feature request.
- [ ] I understand the difference between *Streamlink* and *Streamlink Twitch GUI*.
- [ ] I tried solving my issue by reading the project's wiki first.
- [ ] I have read the contribution guidelines and used the search function to find already existing threads.

### Description

...

### Expected / Actual behavior

...

### Reproduction steps

1. ...
2. ...
3. ...

### Environment details

Operating system and version: ...
Streamlink Twitch GUI version: ...
Streamlink version: ...
Configuration details: ...

...

### Comments, logs, screenshots, etc.

...

Fix typo in issue template
Fix typo in issue template

Resolves #580
