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Since upgrading from v2020.0.12 to v2020.0.13 I'm getting an error popping up in PHP Maker every time I save the project:

"Corrupted loose reference file: refs/heads/master"

Doesn't seem to affect the project file nor the generated code...

Your project file history is probably corrupted. You can delete it but the history will be lost. You may back up all your projects first, then delete C:\Users\<user>\Documents\PHPMaker\Backup\.git and try again.