The value of Text1-Height is negative in the attached f3d. The value should be 8 mm, as seen by inspecting the text. (This breaks my script, when it's trying to correct for the SketchText.height bug).
The document was created before text height parameters existed.
Note: When I exported my document and saved it as f3d, I did not first see Text1-Height after opening it. However, the value is still there, as scripts still pick it up from allParameters.
Workaround, to restore the correct value: Edit the sketch text manually to correct the parameter. Nothing needs to be done. Just Edit the text, confirm that the height is correct and press Ok.
ParametricText add-in issue reference: https://github.com/thomasa88/ParametricText/issues/24
