At the end of the Update() method in the SuperTextMesh class, there's the possibility of a null deref if the rect transform has no parent. I know this is a pretty weird scenario, but it managed to come up in my work, so I thought I would just toss it up here! Including changes for completeness. Also, I wasn't completely sure whether a null value should result in a true or false here for the parent changed flag.
// if(uiMode && (tr.hasChanged || tr.parent.hasChanged)) // ORIGINAL
if (uiMode && (tr.hasChanged || (tr.parent != null && tr.parent.hasChanged))) // DRAQUE
{
if(tr.hasChanged) tr.hasChanged = false;
// if(tr.parent.hasChanged) tr.parent.hasChanged = false; // ORIGINAL
if (tr.parent != null && tr.parent.hasChanged) tr.parent.hasChanged = false; // DRAQUE
//Debug.Log(this.name + " detected OTHER rect change!");
CheckRectChange();
}