Previous, when pressing `Ctrl+V`, the following error will occur:

```
.config/nvim/lua/statusline/init.lua:25: attempt to concatenate a nil value function: builtin#18 /Users/a0233027/.config/nvim/lua/statusline/init.lua:25: attempt to co...fig/n
vim/lua/statusline/init.lua:25: attempt to concatenate a nil value function: builtin#18 /Users/a0233027/.config/nvim/lua/statusline/init.lua:25: attempt to concatenate a nil value
E15: Invalid expression: luaeval('require("galaxyline").component_decorator')("ViMode")
```

This is due to that there is no color was set for `block selection mode` in vim.