go: x/tools/gopls: constant crashing with emacs-lsp

What version of Go are you using (go version)?

$ go version
go version go1.14.1 darwin/amd64

Does this issue reproduce with the latest release?

Currently 1.14.1 is the latest release.

What operating system and processor architecture are you using (go env)?

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/mark/Library/Caches/go-build"
GOENV="/Users/mark/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/mark/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/03/l39qx4sd3g31crj98xtwz44h0000gn/T/go-build952685482=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Set up gopls, emacs-lsp & lsp-ui

GO111MODULE=on go get golang.org/x/tools/gopls@latest

(autoload 'go-mode "go-mode" nil t)
(add-to-list 'auto-mode-alist '("\\.go\\'" . go-mode))
(add-hook 'go-mode-hook 'lsp-deferred)

… and trying to use Emacs for writing code

What did you expect to see?

Autocompletion etc. working without constant crashing

What did you see instead?

Emacs asking if I want to restart gopls and in *gopls::stderr*:

panic: runtime error: index out of range [0] with length 0

goroutine 5076 [running]:
golang.org/x/tools/internal/imports.(*ModuleResolver).init(0xc004132be0, 0x0, 0xc0006940c0)
	/Users/mark/go/pkg/mod/golang.org/x/tools@v0.0.0-20200316194252-fafb6e2e8a4a/internal/imports/mod.go:85 +0xfac
golang.org/x/tools/internal/imports.(*ModuleResolver).ClearForNewMod(0xc004132be0)
	/Users/mark/go/pkg/mod/golang.org/x/tools@v0.0.0-20200316194252-fafb6e2e8a4a/internal/imports/mod.go:194 +0xa2
golang.org/x/tools/internal/lsp/cache.(*view).RunProcessEnvFunc(0xc000290280, 0x1a123c0, 0xc005a352f0, 0xc006eef400, 0x0, 0x0)
	/Users/mark/go/pkg/mod/golang.org/x/tools@v0.0.0-20200316194252-fafb6e2e8a4a/internal/lsp/cache/view.go:279 +0x33f
golang.org/x/tools/internal/lsp/source.AllImportsFixes(0x1a123c0, 0xc005a352f0, 0x1a245c0, 0xc00079c060, 0x1a10a80, 0xc0002b0720, 0x0, 0xc00035ed60, 0x2, 0x2, ...)
	/Users/mark/go/pkg/mod/golang.org/x/tools@v0.0.0-20200316194252-fafb6e2e8a4a/internal/lsp/source/format.go:87 +0x479
golang.org/x/tools/internal/lsp.(*Server).codeAction(0xc00021dc80, 0x1a123c0, 0xc00595a390, 0xc005ea0780, 0xc005ea0780, 0x0, 0x0, 0x0, 0xc00466cd10)
	/Users/mark/go/pkg/mod/golang.org/x/tools@v0.0.0-20200316194252-fafb6e2e8a4a/internal/lsp/code_action.go:68 +0x8f5
golang.org/x/tools/internal/lsp.(*Server).CodeAction(0xc00021dc80, 0x1a123c0, 0xc00595a390, 0xc005ea0780, 0xc005ea0780, 0x0, 0x0, 0x1038bc3, 0x17e0260)
	/Users/mark/go/pkg/mod/golang.org/x/tools@v0.0.0-20200316194252-fafb6e2e8a4a/internal/lsp/server_gen.go:12 +0x4d
golang.org/x/tools/internal/lsp/protocol.serverHandler.Deliver(0x1a2cbc0, 0xc00021dc80, 0x1a123c0, 0xc00595a390, 0xc004291d00, 0x16e7e00, 0x1a10000)
	/Users/mark/go/pkg/mod/golang.org/x/tools@v0.0.0-20200316194252-fafb6e2e8a4a/internal/lsp/protocol/tsserver.go:433 +0x1e38
golang.org/x/tools/internal/jsonrpc2.(*Conn).Run.func1(0xc00507cde0, 0xc004291d00, 0xc000365140, 0x1a123c0, 0xc00595a390, 0x0, 0x0, 0xc005e15ea0)
	/Users/mark/go/pkg/mod/golang.org/x/tools@v0.0.0-20200316194252-fafb6e2e8a4a/internal/jsonrpc2/jsonrpc2.go:372 +0x160
created by golang.org/x/tools/internal/jsonrpc2.(*Conn).Run
	/Users/mark/go/pkg/mod/golang.org/x/tools@v0.0.0-20200316194252-fafb6e2e8a4a/internal/jsonrpc2/jsonrpc2.go:356 +0x850

Process gopls stderr finished