Infinite loop for key switching

I'm using BTT on mac os, if I switch two keys on my laptop, BTT will be crushed and cannot be opened anymore
For example, in keyboard page -> add a new shortcut mapping -> input: \, output: backspace

Device information:

  • Type of Mac: MacBook pro 13 2015 model
  • macOS version: Mojave
  • BetterTouchTool version: 2.660