Reproduction steps:
1. Open the attached "Archive" project.
2. Open the "Ü" scene.
3. Go to Window > Lighting > Settings.
4. Click Generate Lighting.
- Lighting data doesn't build.
- "Baking lighting data asset failed" error is shown in the console.

Workaround:
Rename the scene.

Note:
There is most likely more than one symbol, that blocks lighting generation.

Reproduced with:
5.4.5f1, 5.5.2p2, 5.6.0f1, 2017.1.0a3
macOS 10.12.3

Not reproducible with:
Windows 10