Systematic panic: runtime error: index out of range [-1] while building container

[snakethatlovesstaticlibs]

Hi team, I'm seeing this stack trace in ~/Library/Containers/com.docker.docker/Data/log/vm/dockerd.log while trying to build a dockerfile. I'm not sure what's causing it, and unfortunately I'm not able to share the dockerfile.

Platform:

• Apple M1 Pro, Sonoma 14.5
• Docker desktop version 4.31.0 (153195) - but I also saw it on 4.32.0

panic: runtime error: index out of range [-1]

goroutine 112437 [running]:
github.com/moby/buildkit/frontend/dockerfile/dockerfile2llb.(*dispatchStates).lastTarget(...)
	/root/build-deb/engine/vendor/github.com/moby/buildkit/frontend/dockerfile/dockerfile2llb/convert.go:904
github.com/moby/buildkit/frontend/dockerfile/dockerfile2llb.toDispatchState({_, _}, {_, _, _}, {{0x4002a23b90, {0x0, 0x0}, {0x0, 0x0}, ...}, ...})
	/root/build-deb/engine/vendor/github.com/moby/buildkit/frontend/dockerfile/dockerfile2llb/convert.go:323 +0x3278
github.com/moby/buildkit/frontend/dockerfile/dockerfile2llb.Dockerfile2LLB({_, _}, {_, _, _}, {{0x4002a23b90, {0x0, 0x0}, {0x0, 0x0}, ...}, ...})
	/root/build-deb/engine/vendor/github.com/moby/buildkit/frontend/dockerfile/dockerfile2llb/convert.go:76 +0x54
github.com/moby/buildkit/frontend/dockerfile/builder.Build.func5({0xaaaae234e118, 0x4003053540}, 0x4002066cc0, 0x400147dc98?)
	/root/build-deb/engine/vendor/github.com/moby/buildkit/frontend/dockerfile/builder/build.go:125 +0xc8
github.com/moby/buildkit/frontend/dockerui.(*Client).Build.func1()
	/root/build-deb/engine/vendor/github.com/moby/buildkit/frontend/dockerui/build.go:39 +0x64
golang.org/x/sync/errgroup.(*Group).Go.func1()
	/root/build-deb/engine/vendor/golang.org/x/sync/errgroup/errgroup.go:75 +0x58
created by golang.org/x/sync/errgroup.(*Group).Go in goroutine 112386
	/root/build-deb/engine/vendor/golang.org/x/sync/errgroup/errgroup.go:72 +0x98
EOF