Fatal error: Call to undefined function fontyourface_ui_enabled_count() in fonts_com.module on line 940

How to reproduce:

1. Enable fontyourface.module
2. Enable fonts_com.module.
3. Visit admin/appearance/fontyourface/browse/fonts_com

Fix:

Either make fontyourface_ui.module a dependency for fonts_com.module or use a module_exists('fontyourface_ui').