Runtime crashes when trying to debug application with --start option

[TsvetanMilanov]

When trying to debug application with the --start option the first debug session is OK. If I start the debugger again without restarting the application on the device - the runtime crashes.
After some investigation I found that this call -> https://github.com/NativeScript/ios-runtime/blob/master/src/debugging/TNSDebugging.h#L77 causes the crash. If I remove the error check the debugger will not start but the third time I start debugging with --start it works.

Steps to reproduce:

1. tns create debug-test
2. cd debug-test
3. Deploy the application and start it.
4. tns debug ios --start --chrome
5. Open the debug url.
6. After the Chrome DevTools are loaded and the application can be debugged - stop the debug command and close the DevTools tab. Don't restart the application on the device.
7. tns debug ios --start --chrome
8. Open the debug url.
9. The application crashes on the device.