Debugger won't open on MacOS (expo)

React Native Debugger app version: 0.12.1
React Native version: https://github.com/expo/react-native/archive/sdk-42.0.0.tar.gz
Platform: iOS
Is real device of platform: ?
Operating System: macOS

Since upgrade react native and expo to the latest version the debugger won't open (it is literally stuck, the icon in the docs suggests it's running but clicking on it has no effect).

My command:
`REACT_DEBUGGER='unset ELECTRON_RUN_AS_NODE && open -g 'rndebugger://set-debugger-loc?port=19001' ||' expo start`

Error message (`mobile` is root directory for expo project):
```bash
error Error while starting custom debugger:, Error: Command failed: unset ELECTRON_RUN_AS_NODE && open -g rndebugger://set-debugger-loc?port=19001 || "/Users/michalkaczanowicz/livehe.re/client_v2/mobile"
LSOpenURLsWithRole() failed with error -600 for the URL rndebugger://set-debugger-loc?port=19001.
/bin/sh: /Users/michalkaczanowicz/livehe.re/client_v2/mobile: is a directory

at ChildProcess.exithandler (child_process.js:303:12)
at ChildProcess.emit (events.js:315:20)
at maybeClose (internal/child_process.js:1021:16)
at Socket. (internal/child_process.js:443:11)
at Socket.emit (events.js:315:20)
at Pipe. (net.js:674:12)
```