<unnamed>:SetFormattedText(): Font not set

[Ronkkrop]

So in TBC classic an addon that I use called tiptac stopped working correctly complaining about:

<unnamed>:SetFormattedText(): Font not set

I dug into the code and tried to determine the cause, assuming it was a load-order change or possibly blizzard changing how/when events fire in the most recent patch, but I could find nothing to indicate that. Defeated, I started putting chewbacca debugs everywhere, and determined that even though the font is indeed being set, it's not:

		bar.text:SetFont(cfg.barFontFace,cfg.barFontSize,cfg.barFontFlags);
		local f,_,_ = bar.text:GetFont()
		print("cheese", cfg.barFontFace, f)

returns:

'cheese Interface\Addons\Details\fonts\Oswald-Regular.otf nil'

The only assumption I have to go on is that this font isn't 'loaded' yet. Am I right? If so, is there an event that fires when a font is loaded? Or how is this dealt with properly? Any insight would be valuable.