Debug fails. "Cannot drop a runtime in a context where blocking is not allowed."

[mite-user]

When running debug version of xwin, it fails with the following message

thread 'main' panicked at 'Cannot drop a runtime in a context where blocking is not allowed. This happens when a runtime is dropped from within an asynchronous context.', /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.10.0/src/runtime/blocking/shutdown.rs:51:21