x/tools/gopls: SIGSEGV in cache.missingModuleError

[praveenys-juniper]

gopls version: v0.5.2
gopls flags:

ATTENTION: PLEASE PROVIDE THE DETAILS REQUESTED BELOW.

Describe what you observed.

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x177db4a]

goroutine 3069 [running]:
golang.org/x/tools/internal/lsp/cache.missingModuleError(0x1b14d40, 0xc0000fc480, 0xc000294600, 0xc002f16f00, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	  mod_tidy.go:371  0x6a
golang.org/x/tools/internal/lsp/cache.modTidyErrors(0x1b03280, 0xc003095140, 0x1b14d40, 0xc0000fc480, 0xc000294600, 0xc005cee1e0, 0xc0016e6c00, 0x5, 0x8, 0x0, ...)
	  mod_tidy.go:228  0xb55
golang.org/x/tools/internal/lsp/cache.(*snapshot).ModTidy.func1(0x1b031c0, 0xc004d13640, 0x1aef480, 0xc0000fc480, 0x0, 0x0)
	  mod_tidy.go:144  0xb45
golang.org/x/tools/internal/memoize.(*Handle).run.func1(0xc00219b010, 0x1b031c0, 0xc004d13640, 0xc004d13600, 0x1aef480, 0xc0000fc480, 0xc00485af60)
	  memoize.go:310  0xa8
created by golang.org/x/tools/internal/memoize.(*Handle).run
	  memoize.go:303  0x185
[Error - 10:16:32 AM] 

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[gopherbot]

Change https://golang.org/cl/267118 mentions this issue: internal/lsp/cache: handle nil pointer exception in missing module error