install stuck at 80%

I'm installing Nethunter on a Nexus 5.

During the install, I selected all the software packages. Unfortunately I only noticed the note at the bottom of the installer notes/log once it started installing.

(The note about NOT installing SuperSU), so I'm assuming this is my problem.

It's stuck at "Installing kernel using AnyKernel2" at 80%.

The last item listed is 'Flashing boot image'

Is there a safe way to recover from this. I don't see any way to interrupt this process so I guess I may have to force a reboot and cross my fingers.

I'll let it sit overnight in case it progresses but if anyone has any advise it would be appreciated.

Thanks

I rebooted and it loaded into Nethunter :)

Should I uninstall the SuperSU app?

Can you describe the status of your nexus 5 at the start of the installation?
What version of android are using?
I tried to install more than 30 times, crashed all and never loaded to the end.