error when loading helvetiker_regular after adding new symbol

[cesarpachon]

hello, I am trying to add a missing symbol to the helvetiker_regular font used in three.js. I didn't found the original ttf file anywhere, neither by looking as "helvetiker" in google.. so I assumed it was "helvetika" but after using that font in facetype website, the three.js fails loading, with different internal errors if I try with reverse order or not.