Passing UTF-8 strings to C results in segmentation fault

I'm trying to add SDL2TTF to my SDL project. I've successfully called SDL2 functions that take C-strings, but now I'm trying to call a function in SDL_ttf now, and it's crashing in what apparently is a UTF8 sizing operation:

	let font = TTF_OpenFont("Sans.ttf", 24)
	let textColor = SDL_Color(r: 255, g: 255, b: 255, a: 255)
	let text = TTF_RenderText_Solid(font, "Dec 10", textColor)    // Segmentation fault on macOS
Thread 1 Queue : (serial)
#0	0x00000001004ba87c in TTF_SizeUTF8_Internal ()
#1	0x00000001004bad2d in TTF_RenderUTF8_Solid ()
#2	0x00000001004bacbe in TTF_RenderText_Solid ()
#3	0x0000000100001f1e in at InfoDisplay.swift:43
#4	0x0000000100003800 in main at main.swift:6
#5	0x00007fff735fa3d5 in start ()

Any idea what might be happening in here? Thanks.

Are you sure it's the UTF-8 string passing that's causing the issue in this case? Could the font returned by TTF_OpenFont be invalid/nil?

Ugh, I'm an idiot. I thought I had checked this but I hadn't. Let's fix that issue first. brb…