Can not open PDF.

Today we caught this build error:
Matrix mat = new Matrix(SCALE_COEFF, 0, 0, -SCALE_COEFF, 0, pageHeight);
curInk = new Ink(width);
curInk.OnDown(x, y);
curInk.OnMove(x, y); // if x=0 and y=0
mat.TransformInk(curInk);
page.AddAnnotInk(curInk); // crash from the native level

in previous versions of your SDK, this error is not always manifested. Now it shows constant.
please fix it bug.

Are you testing last beta? 3.5beta9?
You're pasting some code and not the error, may you load the error or the crashlog too?
Are you experiencing it with a specific pdf file?
May you load it? Even as trouble ticket?