sign: resolver attempting to index a nil value (local 'object')

[d-enk]

How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

Which OS are you using?

Linux

What is the issue affecting?

Other

Expected Behaviour

No errors

Actual Behaviour

Error

Reproduction steps

Reproducible in my large project
I tried to write a simple reproducer but it requires more understanding of the code and what exactly is going wrong

Additional Notes

lua-language-server/script/vm/sign.lua

Lines 150 to 152 in d912dfc

	if farg then
	resolve(arg.extends, vm.compileNode(farg))
	end

This place just looking like bug
But perhaps this solution is not correct

if farg and arg.extends then

Log File

script/vm/sign.lua:70: attempt to index a nil value (local 'object')
stack traceback:
	script/vm/sign.lua:70: in upvalue 'resolve'
	script/vm/sign.lua:185: in upvalue 'resolve'
	script/vm/sign.lua:72: in local 'resolve'
	script/vm/sign.lua:292: in method 'resolve'
	script/vm/generic.lua:123: in method 'resolve'
	script/vm/compiler.lua:1141: in upvalue 'bindReturnOfFunction'
	script/vm/compiler.lua:1613: in function <script/vm/compiler.lua:1526>
	(...tail calls...)
	script/vm/compiler.lua:1902: in upvalue 'compileByNode'
	script/vm/compiler.lua:1992: in function 'vm.vm.compileNode'
	(...tail calls...)
	script/vm/compiler.lua:1640: in function <script/vm/compiler.lua:1637>
	(...tail calls...)
	...	(skipping 7 levels)
	script/vm/def.lua:91: in function 'vm.vm.getDefs'
	script/core/diagnostics/inject-field.lua:58: in local 'callback'
	script/parser/guide.lua:735: in function 'parser.guide.eachSourceType'
	script/core/diagnostics/inject-field.lua:108: in function 'core.diagnostics.inject-field'
	script/core/diagnostics/init.lua:118: in upvalue 'check'
	script/core/diagnostics/init.lua:179: in function 'core.diagnostics'
	[C]: in function 'xpcall'
	script/provider/diagnostic.lua:334: in function 'provider.diagnostic.doDiagnostic'
	[C]: in function 'xpcall'
	script/provider/diagnostic.lua:692: in upvalue 'callback'
	script/files.lua:938: in function <script/files.lua:937>