Builds using PUN causes Windows Defender to delete the .exe?

I've run into an issue using Photon Unity Networking. Whenever I build my game and run the .exe file, Windows Defender pops up and tells me it detected a HackTool: Win32/KeyGen and deletes the .exe file. This only happens using PUN, whenever I'm not using it this warning doesn't pop up.

How can this be solved? Everyone who is downloading the game gets this Windows Defender warning....