[5.1.3f1] - "Invalid AABB aabb" error...what does this mean devs?

I have been working on a project for a little while and was spending the last few days polishing it up when I ran into this weird bug:

Invalid AABB aabb

Appears as a red critical error in the log.

I know it's axis-aligned bounding box and relates to the render bounds. I'm just not sure how what I'm doing impacts that. I've been trying various things but can't seem to fix it. A little background:

• I have a single canvas in my scene which houses all of my ui.
• The...

[5.1.3f1] - "Invalid AABB aabb" error...what does this mean devs?