Blocked:Mixed-Content - file URL was only 'https:' and treated as font

Does anyone experienced this issue as well? There are attempts to load a font/s that is/are being considered as mixed-content. But then the URL of the file was only https: no actual file name that could be considered as a font is given.

All the fonts that I'm expecting to be loaded is already loaded and working just fine.

blocked:mixed-content; web console screenshot