Invalid channel id when trying to restart debugger

I'm not sure if I'm exiting properly but when debugging in neovim, I'll enter `stop` to exit a debug session, but then when I try to start another debug session, I see the following error message in the command bar:

```
neobugger#Handle module[gdb].Restart() error.Vim(call):E900: Invalid channel id  
```

Any help with this issue would be appreciated.