Seeing `ag --vimgrep` output in my terminal after closing vim

[rorybyrne]

See the screenshot below. Is there any way to avoid this happening?

[RednarRosique]

Adding set shellpipe=> to my .vimrc fixed it for me (found the answer in this other thread #18)
Note that it blocks shell output from other plugins, but there's a workaround for that described in the same thread.