Thanks, that’s a good tip. I copied these directly from another YAML file, it’s pretty plausible I used a tab to format them so maybe that was all it was.
Also check the PHP/error logs for plugin related errors. When the plugin needs such environment variables and they aren’t set properly, the plugin may cause a fatal PHP error.
Thanks for the help everyone. Just wanted to close the loop on this in case anyone stumbles across this with an error of their own.
It turns out I had an issue in my production environment config file, which makes sense as to why it worked on staging and not production. I was using env() to get a environment variable, switching to getenv() has fixed it.
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Hi James, just wanted to thank you for coming back and listing the reason you were having this error. I ran into this error yesterday after modifying my staging config and your thread here helped me out. 
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