How to debug errors with this workflow?

[neon64]

I receive the following error trying to deploy my application:

Run deployphp/action@master
  with:
    private-key: ***
    known-hosts: ***
  
    ssh-config: ***
  
    dep: deploy -v
Error: Callback must be a function. Received undefined

The error message here looks like it comes from the JavaScript in this repo. Is there a good way to debug it?

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[jlmmns]

Try -vvv instead of -v, perhaps?

I'm having trouble debugging this Deployer Action as well. (#21)