Using stitcher class with mask

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Hi, I have some images which were taken on a microscope and I would like to stitch it. When I am doing it one by one it mostly works fine. But sometimes it stitch it from opposite side (very repeatable pattern on the image). I tried to use mask for the stitching, by creating an array in numpy, but I always get back the status 1.

So I tried to create a mask with all 1, to test it. And still get the same status. On the same images without the masks everything works well. Does anyone have a working example of using it with mask?

I am using python 3.6 and cv4.