Update on this:
Maybe it’s an AE CC 2019 (v16.1.3) issue. I just tried loading the original project file without changing _anything_ but as soon as I click on the text layer I get the “invalid numeric result” error in the same place. Same error after typing in your non-zero fix. Same error if I delete the text layer, so likely it’s just a coincidence activating the text triggers the error.
BUT it appears to be working in AE CS6. So maybe I’m okay…