panic: index out of range in widget_menu.go:49

[lmorg]

panic: runtime error: index out of range [-22]

goroutine 1 [running, locked to thread]:
github.com/lmorg/ttyphoon/window/backend/renderer_sdl.(*menuWidgetT).highlightCallback(...)
	/Users/laurencemorgan/dev/go-lmorg/ttyphoon/window/backend/renderer_sdl/widget_menu.go:49
github.com/lmorg/ttyphoon/window/backend/renderer_sdl.(*menuWidgetT).updateHighlight(0x140001c4750?, 0x10479589c?)
	/Users/laurencemorgan/dev/go-lmorg/ttyphoon/window/backend/renderer_sdl/widget_menu.go:332 +0x114
github.com/lmorg/ttyphoon/window/backend/renderer_sdl.(*menuWidgetT).eventMouseWheel(0x140001c4750, 0x104948e48?, 0x1072651d0?)
	/Users/laurencemorgan/dev/go-lmorg/ttyphoon/window/backend/renderer_sdl/widget_menu.go:415 +0xd0
github.com/lmorg/ttyphoon/window/backend/renderer_sdl.(*sdlRender).eventMouseWheel(0x140000f8000?, 0x1401afb2ca8?)
	/Users/laurencemorgan/dev/go-lmorg/ttyphoon/window/backend/renderer_sdl/event_mouse.go:28 +0x50
github.com/lmorg/ttyphoon/window/backend/renderer_sdl.(*sdlRender).eventLoop(0x140000f8000)
	/Users/laurencemorgan/dev/go-lmorg/ttyphoon/window/backend/renderer_sdl/event_loop.go:52 +0x300
github.com/lmorg/ttyphoon/window/backend/renderer_sdl.(*sdlRender).Start(0x140000f8000, 0x140000f8000?, {0x106858720?, 0x14003abe2c0?})
	/Users/laurencemorgan/dev/go-lmorg/ttyphoon/window/backend/renderer_sdl/start.go:172 +0xf8
github.com/lmorg/ttyphoon/window/backend.Start(...)
	/Users/laurencemorgan/dev/go-lmorg/ttyphoon/window/backend/backend.go:13
main.tmuxSession()
	/Users/laurencemorgan/dev/go-lmorg/ttyphoon/main.go:63 +0x154
main.main()
	/Users/laurencemorgan/dev/go-lmorg/ttyphoon/main.go:29 +0x58