When accidently using Bclose in while nerdtree buffer, things go very wrong.

[realestninja]

When using Bclose while nerdtree buffer is active, then it closes the nerdtree but keeps that buffer in its size. When opening a new nerdtree, the new nerdtree takes 50% of vim.

Is there a way to check wheather the current buffer is not an instance of nerdtree and only then run butane?