Some custom fonts break games that are launched in HTML5

A user complained that a font was not showing up in their project. While investigating this issue, I found that certain fonts will cause the project to no longer work when launched to FireFox. The browser throws an error and then refuses to actually play the project.

Custom fonts that work in the example project provided:

Tresdias

Fonts that don't work:

Aprecu_Mono
Bolina

1. Download attached project
2. Open project
3. Launch project with HTML5
4. Notice that it works just fine
5. Close the browser
6. Open the Widget blueprint "TextTest"
7. Change the font to "Bolina"
8. Launch project with HTML5
9. Notice that the project throws an error and freezes up

UMG Widgets and HTML5