XF 2.1.7 - imPecl - Imagick resizing problem

I have a problem where the Imagick drivers fails to downscale an image. I have a feeling it has something to do with the foreach loop, but I have no idea why. The reason I made the foreach example is because XenForo does the same thing. After calling thumbnailimage the image returns false on isValid() / valid(). Do we need some sort of conditional on when to foreach and when not to...

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source https://xfworld.net/threads/xf-2-1-7-impecl-imagick-resizing-problem.47695/