--- Comment #2 from Redford <> ---
(In reply to Jaap Keuter from comment #1)
> See the very last section (2.11) of README.dissector[1], which states that
> tree may be NULL and your code has to work either way.
> [1]
> README.dissector

This README is for writing dissectors in C, not Lua. Even if you would pass
`nil` to string.format that doesn't cause a crash in standard Lua interpreter.
The bug here seems to break Lua safety - you can't dereference invalid pointer
in Lua, this is only possible when there's a bug in its engine or in
Wireshark's extensions.

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