Getting Fatal PHP Error - Aborted trying to redefine constant 'WP_HOME'

Hi, had a site go down overnight for no obvious reason - the only thing in the error logs is:

`PHP Fatal error:  Uncaught Roots\WPConfig\Exceptions\ConstantAlreadyDefinedException: Aborted trying to redefine constant 'WP_HOME'.`

Nothing that I can see has been changed or redefined. No code has been updated, but all of a sudden it runs a fatal error and 500’s.

Would anyone have any idea why this might happen, and how to fix it to get the site back up?

Many thanks!

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