runtime error of formatter

[sumneko]

How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

Which OS are you using?

Windows

What is the issue affecting?

Formatting

Expected Behaviour

no error

Actual Behaviour

script\core\type-formatting.lua:206: attempt to index a boolean value (local 'result')
stack traceback:
script\core\type-formatting.lua:206: in upvalue 'typeFormat'
script\core\type-formatting.lua:237: in function 'core.type-formatting'
script\provider\provider.lua:1321: in function <script\provider\provider.lua:1310>
[C]: in function 'xpcall'
script\proto\proto.lua:191: in function <script\proto\proto.lua:166>

Reproduction steps

1. Go to '...'
2. Click '...'
3. See error '...'

Additional Notes

@CppCXY

Log File

No response