fix: the server could crash if a client sends invalid frames

[jonasgloning]

Closes #290

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:tada: This PR is included in version 1.0.0-rc.5 :tada:

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[github-actions[bot]]

:tada: This PR is included in version 1.0.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release
• v1.0.0

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